Patent Description:
In one example, a gonio lens allows an observer to visually assess inflammation or structural defects in the trabecular meshwork and related adjacent structures in the eye. As another example, a gonio lens can be configured for viewing and treating an eye, such as an iridotomy goniolaser lens and a trabeculoplasty goniolaser lens (e.g., a Selective Laser Trabeculoplasty lens or SLT lens). The observer may assess the trabecular meshwork before, during, and after the treatment with laser energy to thereby assess the efficacy of the treatment. In other procedures, the gonio lens may be used in surgery.

Some lenses may include a plurality of mirrors, such as the Ocular Three Mirror Universal, manufactured by Ocular Instruments, Inc. , of Bellevue, Washington, wherein the mirrors are circumferentially spaced respectively <NUM> degrees apart and are mounted at different angles of inclination. Each different mirror angle allows the user to inspect and evaluate different portions of the eye. Some lenses have a plurality of mirrors all having the same angle of inclination, such as the Ocular Posner Diagnostic and Surgical Gonio lens, also manufactured by Ocular Instruments, Inc. , which can help reduce the need to rotate the mirror. As another example, a lens may include a single mirror, such as the Ocular Magna View Gonio, also manufactured by Ocular Instruments, Inc. As another example, a lens may include two mirrors, such as the Ahmed DVX direct view surgical gonio lens, also manufactured by Ocular Instruments, Inc. , for an unreversed view, which is particularly helpful during surgical procedures.

The selection and position of the specific mirror to be used during an evaluation will depend upon the portion of the eye that needs to be evaluated. The selected mirror is generally positioned opposite the area to be evaluated. For example, if the <NUM> o'clock position of the peripheral retina needs to be evaluated and a mirrored lens is being utilized, an angled mirror can be positioned at the <NUM> o'clock position of the retina so as to view the affected area.

Whether a multiple mirror lens or a single mirror lens, it may be necessary to rotate the lens up to <NUM> degrees to examine the entire retina or other portions of the eye or to conduct a full treatment on the entire eye.

<CIT> discloses a mirror contact glass with a viewing surface for placing on the sclera of the human eye for examining peripheral fundus and vitreous body sections or the like, wherein a rotary part of a holder of the mirror contact glass has a riffle.

<CIT> describes a lens assembly with a rotating member and a fixed member, wherein the fixed member comprises grooves to help the user grip the lens assembly.

The task of providing an improved lens indexing assembly is solved by a lens indexing assembly according to claim <NUM> and a method of using a lens indexing assembly according to claim <NUM>.

The foregoing aspects and many of the attendant advantages of the present disclosure will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:.

The detailed description set forth below in connection with the appended drawings where like numerals reference like elements is intended as a description of various embodiments of the disclosed subject matter and is not intended to represent the only embodiments. The illustrative examples provided herein are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Similarly, any steps described herein may be interchangeable with other steps, or combinations of steps, in order to achieve the same or substantially similar result. Accordingly, the following descriptions and illustrations herein should be considered illustrative in nature, and thus, not limiting the scope of the disclosed subject matter.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of exemplary embodiments of the present disclosure. It will be apparent to one skilled in the art, however, that many embodiments of the present disclosure may be practiced without some or all of the specific details. In some instances, well-known process steps have not been described in detail in order not to unnecessarily obscure various aspects of the present disclosure. Further, it will be appreciated that embodiments of the present disclosure may employ any combination of features described herein.

Language such as, but not limited to, "top surface", "bottom surface", "side edge", "vertical", "horizontal", and "lateral" in the present disclosure is meant to provide orientation for the reader with reference to the drawings and is not intended to be the required orientation of the components or to impart orientation limitations into the claims.

Embodiments of the present disclosure are generally directed to indexing lens assemblies, and methods of indexing a rotating portion with lens relative to a holding portion, such as a contact lens or a gonio lens assembly used in optometry and ophthalmology. As used herein "indexing" refers to achieving precise rotation of a lens assembly in uniform increments. Each incremental rotated position is sometimes referred to as an "indexing position". In an embodiment, an indexing position is achieved via tactile feedback in the form of surface contour alignment of a tactile feature of the rotating portion and lens with a tactile feature of the holding portion supporting the rotating portion. In other embodiments, an indexing position may be achieved by tactile feedback in the form of a user understanding relative positioning of adjacent fingers on the user's hand.

According to the claimed invention, the rotating portion and the holding portion of the indexing lens assembly each include a plurality of tactile features on the exterior periphery to achieve an indexing position when the tactile features on the rotating portion become aligned with the tactile features on the holding portion. The indexing positions correspond to predetermined angular positions of the ophthalmic lens relative to a central axis through the indexing lens assembly. In some embodiments of the present disclosure, achieving alignment does not rely on sensing increased resistance to rotation or even visually sighting the alignment. Achieving an indexing position in accordance with the claimed invention is sensed through tactile feedback by the fingertips sensing when a tactile feature is in alignment with another tactile feature.

In some embodiments of the present disclosure, resistance to rotation is the normal resistance that is inherent when a plain bearing surface of the rotating portion is in contact with a second plain bearing surface of the holding portion when the lens indexing assembly in in contact with an eye. In embodiments of the present disclosure, the resistance to rotation is substantially constant at all angular positions of the ophthalmic contact lens, even at the indexing positions and from one indexing position toward another indexing position.

Referring to <FIG>, one embodiment of a lens indexing assembly <NUM> in accordance with the present disclosure can be seen. The lens indexing assembly <NUM> in the illustrated embodiment includes a holding portion <NUM>, a rotating portion <NUM> configured to rotate relative to the holding portion <NUM>, and a lens <NUM> attached with the rotating portion <NUM> such that the rotating portion <NUM> and lens <NUM> rotate together as a unit. The rotating portion <NUM> rotates relative the holding portion <NUM> (as indicated by the arrow in <FIG>) to achieve indexing positions that help the user orient the positioning of the rotating portion <NUM> and lens <NUM> relative to the holding portion <NUM>. As described further below, the indexing positions of the illustrated embodiment are achieved when tactile features <NUM> on the rotating portion <NUM> are in alignment with tactile features <NUM> on the holding portion <NUM>. In other embodiment of the present disclosure, the indexing positions are achieved when tactile features on the rotating portion are rotated by a finger on the hand of a user in reference to other fingers on the hand of a user, as described in greater detail below.

Referring to the exploded view in <FIG>, the holding portion <NUM> is generally comprised of an annular body <NUM> defining inner and outer surfaces <NUM> and <NUM> and top <NUM> and bottom <NUM> axial surfaces. The annular body <NUM> defines an inner bore having a central axis <NUM> to permit viewing through the holding portion <NUM> to the lens <NUM> when the lens indexing assembly <NUM> is assembled. In use, the central axis <NUM> generally aligns with the optical axis of the eye.

Extending from the top axial surface <NUM> of the body <NUM> in the illustrated embodiment, the holding portion <NUM> includes holding tabs <NUM>, which are configured for allowing a user to hold the holding portion <NUM> with a thumb T and index finger I (see <FIG>). In that regard, the holding portion <NUM> and the holding tabs <NUM> are sized, designed, and configured for user comfort. The spacing between the holding tabs <NUM>, allows for adequate light to enter the inner bore of the holding portion <NUM> to permit illumination through the holding portion <NUM> to the lens <NUM> when the lens indexing assembly <NUM> is assembled. In other embodiments, however, the holding portion <NUM> may include a different holding configuration, for example, a continuous holding portion instead of holding tabs <NUM>.

As described above, the rotation portion <NUM> of the lens indexing assembly <NUM> is configured for rotational movement relative to the holding portion <NUM>. In the illustrated embodiment, the inner surface <NUM> of the holding portion <NUM> is a smooth surface having an even and regular surface substantially free from perceptible projections or indentations, and functions as a plain bearing surface when mated to the rotating portion <NUM>.

In the illustrated embodiment, the outer surface <NUM> of the holding portion <NUM> includes a plurality of tactile features <NUM>. In the illustrated embodiment, the tactile features <NUM> are spaced evenly or uniformly around the outer surface <NUM> of the holding portion <NUM>. However, other non-uniform spacing of the tactile features <NUM> is within the scope of the present disclosure.

The outer surface <NUM> of the holding portion <NUM> can be considered to have an outer radius from the central axis <NUM> of the holding portion <NUM> in places where there is an absence of the tactile features <NUM>. The tactile features <NUM> extend to a radius that can be different from the outer radius of the outer surface <NUM>. In some embodiments, each tactile feature <NUM> on the outer surface <NUM> can have the same arc length along the outer surface <NUM>, and each tactile feature <NUM> can be spaced apart from the adjacent tactile features by a similar arc length. The arc length of the tactile features <NUM> extend from side edge <NUM> to side edge <NUM>.

The space on the outer surface <NUM> between the tactile features <NUM> can be considered to have the outer radius of the outer surface <NUM>. In the illustrated embodiment, the tactile features <NUM> extend axially at least to the lower outer edge between the outer surface <NUM> and a bottom axial surface <NUM> of the holding portion <NUM>, but in this embodiment, do not need to extend axially to the upper edge between the outer surface <NUM> and a top axial surface <NUM> of the holding portion <NUM>. Placing the tactile features <NUM> at least to the lower outer edge can help facilitate alignment with the tactile features <NUM> of the rotating portion <NUM>.

In the illustrated embodiment, the tactile features <NUM> are indentations in the outer surface <NUM> of the holding portion <NUM>. Therefore, the tactile features <NUM> extend to a radius less than the outer radius of the outer surface <NUM>. In some embodiments, the tactile features can be protrusions instead of indentations, for example, with the protrusions extending to a radius greater than the outer radius of the outer surface <NUM>. In some embodiments, the tactile features can be any surface contours, such as indentations or protrusions that differ with respect to radius from the outer radius of the outer surface <NUM>.

In the illustrated embodiment, the tactile features <NUM> comprise indentations defined to receive the fingertip of a user. Such tactile features can be referred to as "fingertip grooves" because they are configured to accommodate the size and shape of an average finger. In the illustrated embodiment, the tactile features <NUM> are rounded indentations extending between side edges <NUM> having a partial cylindrical shape and a partial spherical shape adjoined together. In some embodiments, the tactile features <NUM> can be indentations having other shapes. For example, in some embodiments, the tactile features <NUM> can only comprise partial cylindrical shape and a partial spherical shape. In some embodiments, the tactile features <NUM> do not require roundness, but can be square or rectangular shapes. In some embodiments, the tactile features <NUM> can be V-shaped indentations.

As described in greater detail below, the lower axial surface <NUM> of the holding portion <NUM> functions as an axial plain bearing surface. As described in detail below, the rotating portion <NUM> of the indexing lens assembly <NUM> is connected to the holding portion <NUM> such that an upper axial surface <NUM> of the rotating portion <NUM> is located adjacent the bottom axial surface <NUM> of the holding portion <NUM>.

Referring to the rotating portion <NUM> in <FIG>, the rotating portion <NUM> is generally comprised of an annular body <NUM> defining an inner bore having a central axis <NUM> to permit viewing through the lens <NUM> when the lens indexing assembly <NUM> is assembled. As seen in <FIG>, the central axis <NUM> of the rotating portion <NUM> is co-axial with the central axis <NUM> of the holding portion <NUM> when the lens indexing assembly <NUM> is assembly.

The rotating portion <NUM> includes a first (top) section defining a coupling section <NUM> configured for coupling with the holding portion <NUM>, a second (middle) section defining a tactile section <NUM> including tactile features <NUM> configured for aligning with the tactile features <NUM> on the holding portion <NUM>, and a third (bottom) section defining a lens holding section <NUM> configured for holding a lens <NUM>.

The coupling section <NUM> of the rotation portion <NUM> is a cylindrical section including a plurality of partial cylindrical segments <NUM> and <NUM> extending from the annular body <NUM>, all of similar inner and outer radiuses in a circular arrangement, configured for coupling the rotation portion <NUM> with the holding portion <NUM>. First and second cylindrical segments <NUM> each have an outer surface <NUM> which functions as a radial plain bearing surface that is configured to rotate against the inner plain bearing surface <NUM> of the holding portion <NUM> when the rotation portion <NUM> and the holding portion <NUM> are coupled together. The outer surface <NUM> is of a slightly smaller radius than the inner surface <NUM> of the holding portion <NUM> to allow for coupling of the two portions <NUM> and <NUM>.

The first and second cylindrical segments <NUM> may be considered rigid or semi-rigid, while the third and fourth cylindrical segments <NUM> may be considered to be more flexible than the first and second segments <NUM>. In the illustrated embodiment, the first and second segments <NUM> make up a majority of the circumference in order to be rigid, while the third and fourth segments <NUM> make up a smaller portion of the total circumference, which allows the third and fourth segments <NUM> to flex relative to the first and second segments <NUM>. In some embodiments, the rigid and flexible segments may be made from the same material. In other embodiments, the rigid and flexible segments may be made from different materials to provide for a difference in flexibility.

As can be seen in <FIG>, the first and second segments <NUM> are larger than the third and fourth segments <NUM>. Recesses <NUM> between adjacent segments allow the third and fourth segments <NUM> to flex relative to the first and second segments <NUM>.

The flexible segments <NUM> may comprise a portion of the radial plain bearing surface <NUM>. However, a function of the segments <NUM> is to keep the rotating portion <NUM> axially aligned with the holding portion <NUM> when two are coupled together. In the illustrated embodiment, each flexible segment <NUM> includes an axial shank <NUM> and a radial barb <NUM>. The axial shank <NUM> is slightly greater in the axial dimension than the axial dimension of the holding portion <NUM>. This height difference allows the radial barb <NUM> to clear the holding portion <NUM> and come to rest on the axial upper surface <NUM> as seen in <FIG> and <FIG>. Referring to <FIG> again, the radial barb <NUM> extends out from the axial shank <NUM>. The radial barb <NUM> has an underside surface that makes contact with the axial upper surface <NUM> of the holding portion <NUM> to keep the rotating portion <NUM> axially aligned within the holding portion <NUM>. As seen in <FIG>, the axial upper surface <NUM> of the holding portion extends around the entirety of the annular wall <NUM> of the holding portion <NUM>, allowing for <NUM> degree rotation of the rotation portion <NUM> relative to the holding portion <NUM>.

Further, the flexible cylindrical segments <NUM> also render the rotating portion <NUM> separable from the holding portion <NUM>. First, to attach the rotating portion <NUM> to the holding portion <NUM>, the flexible segments <NUM> can be depressed radially so that the radial barbs <NUM> clear the inner radius of the holding portion <NUM>, and the rotating portion <NUM> is slipped into the holding portion <NUM> such that the plain bearing surface <NUM> of the rotating portion <NUM> is mated against the inner plain bearing surface <NUM> of the holding portion <NUM>. When coupled, a radial surface of the radial barbs <NUM> is in close proximity with the upper surface <NUM> of the holding portion <NUM>. To release, the radial barbs <NUM> can be depressed radially and the rotating portion <NUM> can be decoupled from the holding portion <NUM>.

When the holding portion <NUM> and the rotation portion <NUM> are coupled, the tactile features <NUM> of the tactile section <NUM> of the rotation portion <NUM> are positioned adjacent the tactile features <NUM> on the holding portion <NUM> and configured for alignment.

In the illustrated embodiment, the rotating portion <NUM> and holding portion <NUM> are separable from one another for cleaning and sterilization, for example, for ophthalmic examination or surgical procedures. However, it should be appreciated that the rotating portion <NUM> need not be removable from the holding portion <NUM>. In that regard, the rotating portion <NUM> may be configured without flexible cylindrical segments <NUM>. In such configuration, the rotating portion <NUM> would be permanently rotatably coupled to the holding portion <NUM>.

Other coupling configurations between the holding portion <NUM> and the rotating portion <NUM> are also within the scope of the present disclosure. For example, in one non-limiting example, the rotating portion <NUM> may optionally include a projection and groove system to maintain the rotating portion <NUM> on the holding portion <NUM>, as described in <CIT>.

The rotating portion <NUM> further includes a tactile section <NUM> including tactile features <NUM> configured for aligning with the tactile features <NUM> on the holding portion <NUM>. When the plain bearing surface <NUM> of the rotating portion <NUM> is aligned with the plain bearing surface <NUM> the holding portion <NUM>, the tactile features <NUM> of the rotating portion <NUM> are adjacent and can be aligned with the tactile features <NUM> on the holding portion <NUM> as the rotating portion <NUM> rotates relative to the holding portion <NUM>. (See, for example, alignment of tactile features <NUM> and <NUM> in <FIG>.

The tactile section <NUM> of the rotating portion <NUM> extends radially from the annular body <NUM> of the rotating portion <NUM>. The tactile section <NUM> is the middle section of the rotating portion <NUM>, between the coupling section <NUM> and the lens holding section <NUM>. The tactile section <NUM> comprises part of the exterior periphery of the lens indexing assembly <NUM> as seen in <FIG>, with the outer radius of the outer surface of the tactile section <NUM> being the same as the outer radius of the holding portion <NUM>.

The tactile features <NUM> are located around the exterior periphery of the tactile section <NUM>. The tactile features <NUM> extend axially in the tactile section <NUM> at least to the upper axial surface <NUM> of the tactile section <NUM> of the rotating portion <NUM>. The rotating portion <NUM> is connected to the holding portion <NUM> such that the upper axial surface <NUM> of the tactile section <NUM> is located adjacent the bottom axial surface <NUM> of the holding portion <NUM>. This relationship between the tactile section <NUM> of the rotating portion <NUM> and the bottom axial surface <NUM> of the holding portion <NUM> places the tactile features <NUM> of the rotating portion <NUM> adjacent to the tactile features <NUM> of the holding portion <NUM>. In this manner, the tactile features <NUM> on the tactile section <NUM> of the rotating portion <NUM> can be aligned with the tactile features <NUM> on the holding portion <NUM>.

When the holding portion <NUM> is coupled to the rotating portion <NUM>, the upper axial surface <NUM> of the tactile section <NUM> of the rotating portion <NUM> is adjacent the bottom axial surface <NUM> of the holding portion <NUM> and acts as a plain bearing surface. Therefore, the holding portion <NUM> is coupled to the rotating portion <NUM> by being held between the radial barbs <NUM> of the coupling portion <NUM> of the rotating portion <NUM> and the upper axial surface <NUM> of the tactile section <NUM> of the rotating portion <NUM>. The external bearing surface <NUM> of the coupling section <NUM> of the rotating portion <NUM> is in a bearing relationship with the interior bearing surface <NUM> of the holding portion <NUM>.

The upper axial surface <NUM> of the tactile section <NUM> of the rotating portion <NUM> supports the partial cylindrical segments <NUM> and <NUM> of the coupling section <NUM> of the rotating portion <NUM>. The inner radius of the tactile section <NUM> can coincide with the inner radius of the coupling section <NUM>. The tactile section <NUM> and the coupling section <NUM> can be formed as a single unit or can be separable.

Like the outer surface <NUM> of holding portion <NUM>, the outer surface <NUM> of the rotating portion <NUM> can be considered to have an outer radius from the central axis <NUM> of the rotating portion <NUM> in places where there is an absence of the tactile features <NUM>. The tactile features <NUM> extend to a radius that can be different from the outer radius of the outer surface <NUM>. In some embodiments, each tactile feature <NUM> on the outer surface <NUM> can have the same arc length along the outer surface <NUM>, and each tactile feature <NUM> can be spaced apart from the adjacent tactile features by a similar arc length. The space on the outer surface <NUM> between the tactile features <NUM> can be considered to have the outer radius of the outer surface <NUM>. Further, the tactile features <NUM> extend axially at least to the upper outer edge between the outer surface <NUM> and the upper axial surface <NUM> of the rotating portion <NUM>, but, do not need to extend axially to the upper edge. Placing the tactile features <NUM> at least to the lower upper edge will facilitate alignment with the tactile features <NUM> of the holding portion <NUM>.

In the illustrated embodiment, the tactile features <NUM> are indentations in the outer surface <NUM> of the rotating portion <NUM>. Therefore, the tactile features <NUM> extend to a radius less than the outer radius of the outer surface <NUM>. In other embodiments, the tactile features may be protrusions instead of indentations, for example, extending to a radius greater than the outer radius of the outer surface <NUM>. In some embodiments, tactile features <NUM> can be any surface contours, such as indentations or protrusions that differ with respect to radius from the outer radius of the outer surface <NUM>.

In the illustrated embodiment, the tactile features <NUM> comprise indentations defined to receive the fingertip of a user. Such tactile features can be referred to as "fingertip grooves" because they are configured to accommodate the size and shape of an average fingertip. In the illustrated embodiment, the tactile features <NUM> are rounded indentations having a partial cylindrical shape. In some embodiments, the tactile features <NUM> can be indentations having other shapes. For example, in some embodiments, the tactile features <NUM> can only comprise partial cylindrical shape and a partial spherical shape. In some embodiments, the tactile features <NUM> do not require roundness, but can be square or rectangular shapes. In some embodiments, the tactile features <NUM> can be V-shaped indentations.

The rotating portion <NUM> further includes a holding section <NUM> configured to hold the lens <NUM>. Suitable lenses for use in the lens indexing assembly <NUM> of the present disclosure include a variety of lenses. In an embodiment, the lens <NUM> is a lens used in ophthalmology, including, but not limited to, a gonio lens. A gonio lens is especially suited to be used in the lens indexing assembly <NUM> because a gonio lens includes at least one mirror to reflect light depending on the direction the mirror is pointed. Thus, the lens indexing assembly <NUM> is particularly suited as a gonioscope to view the periphery of the anterior chamber of the eye.

In the illustrated embodiment, the lens <NUM> is an unreversed prism gonioscopy lens assembly designed to view the periphery of the anterior chamber angle A of the eye. In that regard, the lens assembly <NUM> of the illustrated embodiment is a two-mirrored lens for an unreversed view.

Referring to <FIG>, the holding section <NUM> is configured to hold the lens <NUM> with an interference fit such that the lens <NUM> can be held in place to rotate with the rotating portion <NUM> and such that the lens <NUM> may be removable from the rotating portion <NUM> for cleaning and sterilization.

In the illustrated embodiment, the holding section <NUM> includes a bezel ring <NUM> comprising a plurality of crenulations or segregated teeth <NUM> extending from the inner circumference of the rotating portion <NUM> (see <FIG>). The teeth <NUM> flex when the lens <NUM> is inserted such that the lens <NUM> can be held by a friction fit within the crenulations. The lens <NUM> may be replaceable. Alternatively, the lens <NUM> can be held in the bezel ring <NUM> through an adhesive. As seen in <FIG>, an inwardly extending stopping protrusion <NUM> keeps the lens <NUM> from being inserted past the holding section <NUM>.

In an embodiment, the lens <NUM> is an unhoused lens. As can be seen in <FIG>, the lens <NUM> protrudes from the rotating portion <NUM> to enable direct contact of the lens <NUM> with the eye of a patient. An unhoused lens <NUM> allows for more light to enter the lens from the side to enhance the viewing capabilities of the lens, as compared to light inhibited by a housing for receiving a lens.

In one embodiment, the lens <NUM> has a frustoconical shape. One non-limiting example of a suitable lens is shown and described in <CIT>, issued to Graham al. Another nonlimiting example of a suitable lens is shown and described in<CIT>al.

In one embodiment, the lens may be an Ocular Magna View Gonio, manufactured by Ocular Instruments, Inc. Other non-limiting examples of lenses may include multiple mirror arrangements, such as the Ocular Three Mirror Universal, wherein the mirrors are circumferentially spaced respectively <NUM>° apart and are mounted at different angles of inclination, for example, <NUM>°, <NUM>°, and <NUM>° relative to the vertical, and the Ocular Posner Diagnostic and Surgical Gonioprism with a plurality of mirrors all having the same angle of inclination, both also manufactured by Ocular Instruments, Inc.

In other embodiments, the lens may be cylindrical in shape (see <FIG>).

Tactile features <NUM> and <NUM> on the respective rotating and holding portions <NUM> and <NUM> can be sensed, such as through the fingertips. Particularly, the tactile features <NUM> of the rotating portion <NUM> are designed to be alignable with the tactile features <NUM> of the holding portion <NUM> through touch and without relying on sight or visual recognition. Referring to <FIG>, the tactile features <NUM> of the rotating portion <NUM> are aligned with the tactile features <NUM> of the holding portion <NUM>. In <FIG>, tactile features <NUM> as indentations are aligned with tactile features <NUM> which are also indentations. Both indentations <NUM> and <NUM> have the same arc length. Particularly, alignment can be judged to have occurred when a side edge <NUM> of indentation <NUM> is in line with a side edge <NUM> of indentation <NUM>.

In the configuration of <FIG>, the holding portion <NUM> and rotating portion <NUM> are aligned at one of the predefined indexing positions. In <FIG>, the rotating portion <NUM> is rotated a small amount relative to the holding portion <NUM> so that the tactile features <NUM> of the rotating portion <NUM> are no longer in alignment with the tactile features <NUM> of the holding portion <NUM>. The rotation of the rotating portion <NUM> can continue until a user senses that tactile features <NUM> of the rotating portion <NUM> are once again in alignment with the tactile features <NUM> of the holding portion <NUM>.

To operate the lens indexing assembly <NUM>, the user places the contact surface of the lens <NUM> on an eye of a patient. Referring to <FIG>, the user may grasp the holding portion <NUM> of the lens indexing assembly <NUM> between the thumb T and index finger I. Because the rotating portion <NUM> rotates relative to the rest of the holding portion <NUM>, the user can then use the middle finger M on the same hand to rotate the rotating portion <NUM> and lens <NUM> while holding the holding portion <NUM> in a stationary position. The user can pull on the side edge <NUM> of a tactile feature <NUM> of the rotating portion <NUM> until the user senses through touch via the middle finger M that a tactile feature <NUM> of the rotating portion <NUM> is aligned with a tactile feature <NUM> of the holding portion <NUM> signifying that a predetermined indexing position has been reached.

Using this method, rotation of the lens <NUM> on the eye of the patient can be accomplished by the user with one hand. In an embodiment, there is no increased resistance from rotating away from the indexing position. Any resistance felt is the inherent friction of contact between plain bearing surfaces in the radial and axial directions. For alignment, the user can rely on one indentation being aligned with another indentation. More specifically, a user may rely on the side edges which start and end at each indentation. For example, in <FIG>, tactile feature <NUM> has a side edge <NUM> and tactile feature <NUM> has a side edge <NUM>. Side edges <NUM> and <NUM> become collinear at the moment of alignment.

Holding the holding portion <NUM> stationary while the lens <NUM> is rotated via the rotating portion <NUM> has advantages. Such rotation technique decreases the chance that the lens <NUM> will disengage from or be lifted off the eye of the patient. Also, the rotation technique reduces the formation of air bubbles in the fluid between the lens <NUM> and the eye, which can reflect light and affect the user's ability to evaluate and/or treat the patient's eye.

Even though the holding portion <NUM> and rotating portion <NUM> have tactile features <NUM> and <NUM> that can be used to achieve the indexing positions through touch alone, this does not preclude the addition of marks that are meant to be visually perceived. For example, the holding portion <NUM> or the rotating portion <NUM> or both may include marks on their external surfaces to indicate the beginning or zero position of the <NUM> degree rotation, as well as subsequent numbered points. For example, suitable markings, such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>, may be placed at each tactile feature <NUM> and <NUM>. Moreover, marks intended for visual perception may be included on the lens <NUM>. Although the marks would not be in focus when the user is examining or treating the ocular anatomy, the marks will define useful start and end points for the user. Also the rotating portion <NUM> or the holding portion <NUM> can include a physical stop to prevent the rotation of the collar <NUM> beyond a certain point. The stop may indicate the <NUM> degree position in one direction and the <NUM> degree in the opposite direction. Rotation would not be possible beyond the stop, but rotation would be possible in the direction away from the stop.

In another application, a plurality of indexing marks can be used for relative measurements of ocular structures. For example, if the rotating portion <NUM> is configured to index every <NUM> degrees and is used on a lens that has an embedded indicator, as described in <CIT>, the user would be able to estimate the angular size or arc length of ocular structures.

Moreover, in ocular lenses having a plurality of mirrors, for example, four different mirrors in a square or diamond pattern, the rotating portion <NUM> can be configured to index at four <NUM> degree angle locations to index with each of the different mirrors. Such indexing in this type of lens will save the user time in accurately rotating the lens to correspond with the desired mirror.

Referring to <FIG>, another embodiment of a lens assembly <NUM> in accordance with the present disclosure is provided. The lens assembly of <FIG> is similar in structure as well as function to the previously described lens assembly <NUM> of <FIG>, but includes differences regarding the rotating portion <NUM> and the lens <NUM>, as will be described.

The lens assembly <NUM> in the illustrated embodiment includes a holding portion <NUM>, a rotating portion <NUM> configured to rotate on the holding portion <NUM>, and a lens <NUM> fixedly attached to the rotating portion <NUM> such that the rotating portion <NUM> and lens <NUM> rotate together as a unit. The rotating portion <NUM> is free to rotate on the holding portion <NUM> to achieve indexing positions that help the user orient the positioning of the rotating portion <NUM> and lens <NUM> relative to the holding portion <NUM>. As described further below, the indexing positions are achieved when tactile features <NUM> on the rotating portion <NUM> are in alignment with tactile features <NUM> on the holding portion <NUM>.

In the illustrated embodiment of <FIG>, the lens indexing assembly <NUM> is configured to hold a smaller lens <NUM> having a cylindrical body. Like the holding portion <NUM> of <FIG>, the holding section <NUM> of the holding portion <NUM> of <FIG> is configured to hold the lens <NUM> with an interference fit such that the lens <NUM> can be held in place to rotate with the rotating portion <NUM> and such that the lens <NUM> may be removable from the rotating portion <NUM> for cleaning and sterilization.

Like in the illustrated embodiment of <FIG>, in the illustrated embodiment of <FIG>, the holding section <NUM> includes a crenulated bezel ring <NUM> comprising a plurality of crenulations or segregated teeth <NUM> extending from the inner circumference of the rotating portion <NUM>. The lens <NUM> can be held by a friction fit within the crenulations. The lens <NUM> may be replaceable. Alternatively, the lens <NUM> can be held in the bezel ring <NUM> through an adhesive.

Because the lens <NUM> in the illustrated embodiment of <FIG> is smaller having a smaller diameter and smaller viewing end, the holding section <NUM> of the holding portion <NUM> is configured to hold a smaller lens <NUM>. In the illustrated embodiment, a plurality of radial struts <NUM> extend radially from the inner surface of the holding section <NUM> to support a holding ring <NUM>. The holding ring <NUM> supports the crenulated bezel ring <NUM> comprising a plurality of crenulations or segregated teeth <NUM>. The teeth <NUM> flex when the lens is inserted such that the lens <NUM> can be held by a friction fit within the teeth <NUM>. Spacing <NUM> between the adjacent radial struts <NUM> allows for light to travel through the center bore of the lens indexing assembly <NUM> to aid in illumination of the eye.

Lenses <NUM> may be replaceable. Alternatively, the lens <NUM> can be held in the bezel ring <NUM> through an adhesive.

Referring to <FIG>, another example of a lens assembly <NUM> which does not fall under the scope of the claimed invention. The lens assembly of <FIG> is also similar in structure as well as function to the previously described lens assembly <NUM> of <FIG>, but includes differences regarding the positioning of the holding portion and the rotating portion and differences regarding the tactile features, as will be described.

The lens assembly <NUM> in the illustrated embodiment of <FIG> includes a holding portion <NUM>, a rotating portion <NUM> configured to rotate on the holding portion <NUM>, and a lens <NUM> attached to the rotating portion <NUM> such that the rotating portion <NUM> and lens <NUM> rotate together as a unit. The rotating portion <NUM> is free to rotate relative to the holding portion <NUM> to achieve indexing positions that help the user orient the positioning of the rotating portion <NUM> and lens <NUM> relative to the holding portion <NUM>. As described further below, the rotating portion <NUM> is configured such that the index finger I of the user (rather than the middle finger M of the previously described embodiments) can be used to rotate the rotating portion <NUM>. In addition, the tactile features <NUM> on the rotating portion <NUM> are configured for leverage in rotation and not necessarily for aligning with indentations on the holding portion <NUM>.

In the illustrated embodiment of <FIG>, the indexing positions are achieved when tactile features <NUM> on the rotating portion <NUM> are rotated by a finger on the hand of a user in reference to holding fingers on the hand of a user, as described in greater detail below. The previously described embodiments may also be designed to incorporate the indexing configuration of the illustrated embodiment of <FIG>.

Referring to <FIG>, the rotating portion <NUM> includes a first (top) section defining a tactile section <NUM> including tactile features <NUM> configured for user rotation and indexing, a second (middle) section defining a coupling section <NUM> configured for coupling with the holding portion <NUM>, and a third (bottom) section defining a lens holding section <NUM> configured for holding a lens <NUM>. In contrast with the embodiment of <FIG>, the first and middle sections of the rotating portion <NUM> of the illustrated embodiment of <FIG> are switched such that, when assembled, the tactile section <NUM> is located at the top end of the indexing lens assembly <NUM> above the holding potion <NUM>.

Such configuration of the rotating portion <NUM> (in contrast with the embodiment of <FIG>) allows the user to use his or her middle finger M and the thumb T to hold the holding portion <NUM> of the indexing lens assembly <NUM>, and to use his or her index finger I to rotate the rotating portion <NUM> of the indexing lens assembly <NUM>.

The index finger is generally the most dexterous and sensitive of the fingers, and therefore, can be a better finger than the middle finger for some users for affecting rotation movement of the rotating portion <NUM> of the indexing lens assembly <NUM>. Moreover, in this holding configuration with the middle finger M and thumb T holding the holding portion <NUM> of the indexing lens assembly <NUM>, the indexing finger is further spaced from the patient's head than the middle finger. Such spacing can aid in preventing accidental bumping of the moving finger affecting rotation movement of the rotating portion <NUM> with the patient's forehead or eye region. However, the different designs of <FIG> and <FIG> allow for user selection in rotation finger.

To assembly the lens assembly <NUM> of <FIG>, the holding portion <NUM> is connected to the rotating portion <NUM> from the bottom end of the rotating portion <NUM>. Referring to <FIG>, the holding portion <NUM> is generally comprised of an annular body <NUM> defining inner and outer surfaces <NUM> and <NUM> and top <NUM> and bottom <NUM> axial surfaces. The annular body <NUM> defines an inner bore having a central axis <NUM> to permit viewing through the holding portion <NUM> to the lens <NUM> when the lens indexing assembly <NUM> is assembled.

Extending from the bottom axial surface <NUM> of the holding portion <NUM>, the holding portion <NUM> of the illustrated embodiment further includes extended holding tabs <NUM> to allow the user to grip the holding portion, for example, with a thumb and middle finger, as shown in <FIG>. As best seen in <FIG>, the holding tabs <NUM> are spaced on the outer edge of the bottom axial surface <NUM> of the holding portion <NUM>, so as not to interfere with the rotation of the rotation portion <NUM> relative to the holding portion <NUM>, as described in greater detail below.

As described above, the second (middle) section of the rotation portion <NUM> includes a coupling section <NUM> configured for coupling with the holding portion <NUM>. The coupling section <NUM> of the rotation portion <NUM> is a cylindrical section including a plurality of partial cylindrical segments <NUM> and <NUM> extending from the annular body <NUM>, all of similar inner and outer radiuses in a circular arrangement, configured for coupling the rotation portion <NUM> with the holding portion <NUM>. First and second cylindrical segments <NUM> and <NUM> each have an outer surface <NUM> which functions as a radial plain bearing surface that is configured to rotate against the inner plain bearing surface <NUM> of the holding portion <NUM> when the rotation portion <NUM> and the holding portion <NUM> are coupled together. The outer surface <NUM> is of a slightly smaller radius than the inner surface <NUM> of the holding portion <NUM> to allow for coupling of the two portions <NUM> and <NUM> (see <FIG>).

The first and second cylindrical segments <NUM> may be considered rigid or semi-rigid, while the third and fourth cylindrical segments <NUM> may be considered to be more flexible than the first and second segments <NUM>. In the illustrated embodiment, the first and second segments <NUM> make up a majority of the circumference in order to be rigid, while the third and fourth segments <NUM> make up a smaller portion of the total circumference, which allows the third and fourth segments <NUM> to flex relative to the first and second segments <NUM>. As can be seen in <FIG>, the first and second segments <NUM> are larger than the third and fourth segments <NUM>. Recesses <NUM> between adjacent segments allow the third and fourth segments <NUM> to flex relative to the first and second segments <NUM>.

In some embodiments, the rigid and flexible segments may be made from the same material. In other embodiments, the rigid and flexible segments may be made from different materials to provide for a difference in flexibility.

The flexible segments <NUM> make up a portion of the radial plain bearing surface <NUM> (see <FIG>). However, a function of the segments <NUM> is to keep the rotating portion <NUM> axially aligned with the holding portion <NUM> when two are coupled together. In the illustrated embodiment, each flexible segment <NUM> includes an outwardly extending radial barb <NUM>. The radial barb <NUM> has an upper surface <NUM> that makes contact with the bottom axial surface <NUM> of the holding portion <NUM> to keep the rotating portion <NUM> axially aligned within the holding portion <NUM>.

As seen in <FIG>, the bottom axial surface <NUM> of the holding portion <NUM> in the illustrated embodiment extends around a portion of the annular wall <NUM> of the holding portion <NUM>, allowing for <NUM> degree rotation of the rotation portion <NUM> relative to the holding portion <NUM>. In other embodiments, the holding portion <NUM> may designed for other rotation parameters up to <NUM> degree rotation. For example, the holding tabs <NUM> of the holding portion <NUM> could be designed to limit rotation of the rotating portion <NUM> relative to the holding portion <NUM> within certain rotation limits, such as <NUM> degree rotation.

Further, the flexible cylindrical segments <NUM> also render the rotating portion <NUM> separable from the holding portion <NUM>. First, to attach the rotating portion <NUM> to the holding portion <NUM>, the flexible segments <NUM> can be depressed radially so that the radial barbs <NUM> clear the inner radius of the inner wall surface <NUM> of the holding portion <NUM>. While the flexible segments <NUM> of the rotating portion <NUM> are depressed, the holding portion <NUM> is slipped onto the rotating portion <NUM> such that the plain bearing surface <NUM> of the rotating portion <NUM> is mated against the inner plain bearing surface <NUM> of the holding portion <NUM>. When coupled, a top radial surface of the radial barbs <NUM> is in close proximity with the bottom axial surface <NUM> of the holding portion <NUM> (see <FIG>). To release, the radial barbs <NUM> can be depressed radially and the rotating portion <NUM> can be decoupled from the holding portion <NUM>.

In the illustrated embodiment, the holding section <NUM> includes a bezel ring <NUM> comprising a plurality of crenulations or segregated teeth <NUM> extending from the inner circumference of the rotating portion <NUM> (see <FIG>), similar to previously described embodiments. The teeth <NUM> flex when the lens <NUM> is inserted such that the lens <NUM> can be held by a friction fit within the crenulations. In the illustrated embodiment, the ends of the flexible segments <NUM> are a part of the teeth <NUM> of the lens holding portion <NUM>.

As seen in <FIG>, an inwardly extending stopping protrusion <NUM> keeps the lens <NUM> from being inserted past the holding section <NUM>.

In the illustrated embodiment of <FIG>, unlike the previously described embodiments, the holding portion <NUM> does not include tactile features defining indentations. In contrast, only the rotating portion <NUM> includes tactile features <NUM> on the outer surface of the rotating portion <NUM>.

Instead of indexing being achieved by aligning adjacent tactile features on the holding portion and the rotating portion, as seen in the previously described embodiments, indexing in the illustrated embodiment of <FIG> is achieved by the user's knowledge of a starting position with his or her moving finger and knowing the new position on the moving finger. Indexing also may be achieved by the user's knowledge of a starting position with his or her moving finger and a subsequent visual position of the user's moving finger on the circumference of the eye. For example, the user may start with the index finger I at a <NUM> o'clock position, the middle finger M adjacent the index finger I, also at a <NUM> o'clock position, and the thumb at a <NUM> o'clock position. The user's middle finger M and thumb T remain in the same positions on the holding portion <NUM>. However, the user may move the index finger I and the rotating portion <NUM> from the <NUM> o'clock position to a <NUM> o'clock position to adjust the view of the patient's eye.

Indexing is understood by the user feeling the new relative positioning of the index finger I relative to the middle finger M and/or by visual inspection of the relative positioning of the index finger I relative to the middle finger M.

In the illustrated embodiment, both the holding portion <NUM> and the rotating portion <NUM> include optional knurled sections to improve the user's grip on the lens assembly <NUM>. Such knurled sections may be combined with smooth surfaces to improve grip, as seen in the illustrated embodiment. In other embodiments, other sections may be knurled based on ergonomic design.

In the illustrated embodiment, and in all the embodiments described herein, the tactile features <NUM> on the rotating portion <NUM> provide leverage for the rotating finger. In that regard, the tactile features <NUM> on the rotating portion <NUM> are shown as indentations on the outer surface of the rotating portion <NUM>. Each tactile feature <NUM> has side edges <NUM> on either side of each of the indentations. Depending on the direction of rotation, the user can pull or push on these side edges <NUM> to effect rotation of the rotating portion <NUM> relative to the holding portion <NUM>.

Referring to <FIG>, another example of a lens assembly <NUM> which does not fall under the scope of the claimed invention.

The lens assembly of <FIG> is in many respects similar in structure as well as functions to the previously described lens assembly <NUM> of <FIG>, but includes differences regarding the tactile features, as will be described.

In the illustrated embodiment, the holding portion <NUM> of the lens assembly <NUM> includes at least one tactile feature <NUM>, which allows the user to orient the position of the rotation portion <NUM> of the lens assembly <NUM> with the tactile feature <NUM>. For example, if the user is rotating the rotating portion <NUM> forward to a certain position at a certain degree of rotation, then the user wants to return to the original position, the user can use the at least one tactile feature <NUM> on the holding portion <NUM> to return the rotating portion <NUM> to an original position.

In addition, the tactile section <NUM> of the rotating portion <NUM> in the illustrated embodiment of <FIG> has a smaller height profile as compared to the embodiment of <FIG>, allowing for a more compact design. In addition, the tactile section <NUM> is spaced from the holding portion by distance d (see <FIG>), the tactile features on the rotating portion are configured to be of a different cross-sectional shape, and the sizing of the indexing lens assembly is different, all to improve the ergonomic design for a specific user.

Referring to <FIG>, example of a lens assembly <NUM> which does not fall under the scope of the claimed invention.

The lens assembly of <FIG> <FIG> is in many respects similar in structure as well as functions to the previously described lens assembly <NUM> of <FIG>, but includes differences regarding the lens, as will be described.

The lens <NUM> of the illustrated embodiment of <FIG> is the same as the lens <NUM> in <FIG>. Because the lens <NUM> in the illustrated embodiment of <FIG> is smaller than the lens <NUM> of <FIG>, having a smaller diameter and smaller viewing end, the holding section <NUM> of the rotating portion <NUM> is configured to hold a smaller lens <NUM>. In the illustrated embodiment, a plurality of radial struts <NUM> extend radially from the inner surface of the holding section <NUM> to support a holding ring <NUM>. The holding ring <NUM> supports the crenulated bezel ring <NUM> comprising a plurality of crenulations or segregated teeth <NUM>. The teeth <NUM> flex when the lens is inserted such that the lens <NUM> can be held by a friction fit within the teeth <NUM>. Spacing <NUM> between the adjacent radial struts <NUM> allows for light to travel from through the center bore of the lens indexing assembly <NUM> to aid in illumination of the eye.

Different from the embodiment of <FIG>, the ends of the flexible segments <NUM> are not part of the teeth <NUM> of the lens holding section <NUM>. Instead the flexible segments <NUM> extend in the spacing <NUM> between the adjacent radial struts <NUM> of the lens holding section <NUM>.

Referring to <FIG>, another embodiment of a lens assembly <NUM> in accordance with the present disclosure is provided. The lens assembly of <FIG> is in many respects similar in structure as well as functions to the previously described lens assembly <NUM> of <FIG>, but includes differences regarding the tactile features, as will be described.

In the illustrated embodiment of <FIG>, the holding portion <NUM> does not include tactile features defining indentations; only the rotating portion <NUM> includes tactile features <NUM> on the outer surface of the rotating portion <NUM>. In contrast, in the illustrated embodiment of <FIG>, the holding portion <NUM> of the lens assembly <NUM> includes a tactile feature <NUM> for mating with the tactile features <NUM> of the rotating portion. Like previously described tactile features, the tactile features <NUM> of the illustrated embodiment comprise indentations defined to receive the fingertip of a user. Such tactile features can be referred to as "fingertip grooves" because they are configured to accommodate the size and shape of an average finger.

Referring to <FIG>, another embodiment of a lens assembly <NUM> in accordance with the present disclosure is provided. The lens assembly of <FIG> is similar in structure as well as function to the previously described lens assemblies, including lens assembly <NUM> of <FIG>, but includes differences regarding the rotating portion <NUM>, as will be described. It will be appreciated that the rotating portion <NUM>, or features thereof, can be employed with any embodiment described herein.

The lens assembly <NUM> in the illustrated embodiment includes a holding portion <NUM>, a rotating portion <NUM> configured to rotate on the holding portion <NUM>, and a lens <NUM> fixedly attached to the rotating portion <NUM> such that the rotating portion <NUM> and lens <NUM> rotate together as a unit. The rotating portion <NUM> is free to rotate on the holding portion <NUM> to achieve one or more positions, such as indexing positions, that help the user orient the positioning of the rotating portion <NUM> and lens <NUM> relative to the holding portion <NUM>. The indexing positions are achieved, for example, when tactile features <NUM> on the rotating portion <NUM> are in alignment with tactile features <NUM> on the holding portion <NUM>.

Like in the illustrated embodiment of <FIG>, in the illustrated embodiment of <FIG>, the rotating portion <NUM> includes a first (top) section defining a coupling section configured for coupling with the holding portion <NUM>, a second (middle) section defining a tactile section <NUM> including tactile features <NUM> configured for aligning with the tactile features <NUM> on the holding portion <NUM>, and a third (bottom) section defining a lens holding section <NUM> configured for holding a lens <NUM>.

Like the holding portion <NUM> of <FIG>, the holding section <NUM> of the holding portion <NUM> of <FIG> is configured to hold the lens <NUM> with an interference fit such that the lens <NUM> can be held in place to rotate with the rotating portion <NUM> and such that the lens <NUM> may be removable from the rotating portion <NUM> for cleaning and sterilization. The lens <NUM> can be held by a friction fit. The lens <NUM> may be replaceable. Alternatively, the lens <NUM> can be held via an adhesive.

In the illustrated embodiment, the tactile features <NUM> are indentations in the outer surface <NUM> of the rotating portion <NUM>. In some embodiments, tactile features <NUM> can be any surface contours, such as indentations, that differ with respect to radius from the outer radius of the outer surface <NUM>.

In the illustrated embodiment, the tactile features <NUM> comprise indentations defined to receive the fingertip of a user. In the illustrated embodiment, the tactile features <NUM> have U-shaped (e.g., slightly rounded in some embodiments) indentations. In some embodiments, the U-shape of the indentations is pronounced, such that the indentations are substantially similar to a square or rectangle (with an open top for receiving part of the fingertip) or identical to a square or rectangle. In other words, the indentations are formed as outwardly facing, U-shaped channels, each having a bottom wall and two side walls.

For example, in some embodiments, the tactile features <NUM> can be square or rectangular shaped channels but with small rounded fillets at the intersections between the bottom wall and the side walls of the channel. In some embodiments, each side wall extends slightly inwardly (toward the radial centerline of the channel (e.g., indentation)) into the channel at its outer end (adjacent the intersection with outer surface <NUM>) so as to form a slight overhang <NUM>, as shown in <FIG>. The overhang, in some embodiments, improves the grip and/or leverage between the rotating portion <NUM> and the fingertip, thereby providing more precise control to the user. In some embodiments, the side walls are parallel to each other. In some embodiments, the side walls are parallel to each other and form right angles with the bottom wall of the channel. Of course, in other embodiments, the tactile features <NUM> can be indentations or channels having other shapes.

Claim 1:
A lens indexing assembly (<NUM>), comprising a holding portion (<NUM>) and a rotating portion (<NUM>),
the holding portion (<NUM>) is configured to support the rotating portion (<NUM>), wherein the holding portion (<NUM>) has an outer surface (<NUM>) configured for holding and a bearing surface (<NUM>);
the rotating portion (<NUM>) is configured for coupling with the holding portion (<NUM>), wherein the rotating portion (<NUM>) is configured to rotate relative to the holding portion (<NUM>), and wherein the rotating portion (<NUM>) has a bearing surface (<NUM>) for rotating relative to the bearing surface (<NUM>) of the holding portion (<NUM>), the rotating portion (<NUM>) having an interface for coupling to an ophthalmic contact lens (<NUM>);
characterized in that
the holding portion (<NUM>) includes a plurality of tactile features (<NUM>) on the outer surface (<NUM>) of the holding portion (<NUM>), the plurality of tactile features (<NUM>) of the holding portion (<NUM>) including a plurality of fingertip indentations or a plurality of fingertip protrusions;
wherein the rotating portion (<NUM>) includes a plurality of tactile features (<NUM>) on an outer surface (<NUM>, <NUM>), the plurality of tactile features (<NUM>) of the rotating portion (<NUM>) including a plurality of fingertip indentations or a plurality of fingertip protrusions,
and wherein at least one of the plurality of tactile features (<NUM>) on the outer surface (<NUM>, <NUM>) of the rotating portion (<NUM>) is configured to align with the plurality of tactile features (<NUM>) of the holding portion (<NUM>) as the rotating portion (<NUM>) rotates relative to the holding portion (<NUM>) to provide tactile feedback corresponding to a plurality of angular positions of the ophthalmic contact lens (<NUM>) relative to the holding portion (<NUM>).