Patent Description:
One example of contact lens case is disclosed in <CIT> (<CIT>). In this reference, a structure contains a conservation liquid, a package body provided with a concave portion in which a contact lens is stored, and a lid with which an upper opening of the concave portion is equipped that can cover the upper opening. The contact lens is immersed into conservation liquid and the lid can be secured to the package body to seal preservation liquid and the contact lens within the concave portion. A contact lens case is described in <CIT> and in <CIT>.

The invention is set out in the appened claims.

The lens positioning guide can be a slope formed in the floor.

The lens positioning guide can be configured to contact a peripheral portion of the contact lens.

The lens positioning guide can include a guide curvature where the guide curvature substantially follows an anterior side curvature of the contact lens.

The lens positioning guide can be configured to contact within a peripheral portion defined by a midpoint of a radius of an anterior side of the contact lens and an edge of the contact lens.

The curved surface of the protrusion can be configured to adhere to a posterior side of a contact lens when the contact lens is wetted.

The contact lens case can include a first thread portion connected to the platform portion, and a second thread portion connected to the cap portion. The first thread portion and second thread portion can be configured to be threadedly connected to one another to close off the chamber.

The distal end of the protrusion can extend farther from the cap body than an end of the second threaded portion.

The distal end of the protrusion and the floor of the chamber can be separated by less than <NUM> millimeters when the first thread portion and second thread portion are threadedly connected to one another.

The lens positioning guide can be configured to engage the contact lens in a peripheral portion of the contact lens.

The lens positioning guide can be configured to engage the contact lens on any portion of the peripheral portion, including the perimeter or middle of the peripheral portion of the contact lens.

The lens positioning guide can include a peripheral region, and the peripheral region can be configured to make contact with the contact lens.

The lens positioning guide can include a mid-peripheral region, and the mid-peripheral region can be configured to make contact with the contact lens.

The accompanying drawings illustrate various embodiments of the present apparatus and are a part of the specification. The illustrated embodiments are merely examples of the present apparatus and do not limit the scope thereof, as long as they fall within the scope of the appended claims.

The principles described in the current disclosure relate to contact lens cases. The exemplary contact lens case includes a cavity that holds storage solution, in which a contact lens can be immersed when not being worn by the user. Generally, when a contact lens is removed from a contact lens case, the user's finger is inserted into the cavity of a contact lens case that contains the contact lens and the storage solution. Typically, a user slides a finger along the bottom surface of the case's cavity, pressing down on the back or inner surface of the contact lens, which follows the profile of the user's finger.

The contact lens is then typically slid up the side of the lens case by the finger, dragging the front surface of the lens along the bottom of the lens case, and continuing contact of the back or inner surface of the lens with the user's finger. Once disposed at the opening of the contact lens case, the user can grasp the contact lens with the user's thumb on the outer side of the contact lens and the finger on the back or inner surface of the contact lens to remove the contact lens from the cavity of the contact lens case. The user then typically re-orients the lens on his or her finger and brings the contact lens to his or her eye for insertion. The posterior/concave side of the contact lens, which was engaged with the user's finger, is placed against the user's eye. The tear fluid wets the posterior side of the contact lens keeping the contact lens in place.

Various issues arise with this conventional process of removing a contact lens from the contact lens case. Specifically, the user's finger and/or thumb come into contact with the posterior side of the contact lens, which then comes into direct contact with the user's eye. As a result, germs, dirt, pollutants, and other undesirables from the user's finger can be transferred to the user's eye. These contaminants can cause inflammation of the eye, as well as provide an entry point for disease to enter the user's body.

Other issues with the conventional manner of removing the contact lens from the traditional contact lens case result from inserting a finger into a narrow cavity and sliding the contact lens across surfaces of the cavity. This process can scratch or otherwise damage the inner surface and outer periphery portions of the contact lens. Furthermore, by placing the finger into the cavity of the case where the storage solution resides can expose the storage solution to the user's finger. Thus, the germs, dirt, and pollutants of the user's finger can also contaminate the storage solution.

The principles contained in the present disclosure include a contact lens case that includes a cap portion and a platform portion. The cap portion includes a protrusion that is connected to a cap body. The protrusion includes a distal end that has a curved surface. The platform portion includes a chamber that is defined by an inner wall and floor. The chamber can contain storage solution and a contact lens. The protrusion can be sufficiently long to be submerged into the storage solution when the cap portion is secured to the platform portion. With the distal end submerged into the storage solution, the distal end can be wetted with the storage solution. The posterior side of the contact lens can adhere to the curvature of the distal end when the distal end is wetted.

The user can remove the cap portion of the contact lens case from the platform portion, thereby removing the distal end of the protrusion from the chamber and thus removing the distal end from being submerged in the storage solution in those cases where the chamber contains a sufficient amount of storage solution so that the distal end is submerged. With the distal end wetted, the user can place the contact lens on the curvature of the distal end so that the contact lens' posterior side is in direct contact with the distal end. In some cases, the curvature of the distal end complements or substantially complements the curvature of the contact lens' posterior side. With the contact lens adhering to the distal end of the protrusion, the contact lens can move with the distal end. For example, the contact lens can adhere to and move with the distal end as the cap portion is secured to the platform portion. Thus, in those examples where the chamber includes a sufficient amount of storage solution for the distal end to be submerged, the contact lens is also submerged into the storage solution.

The floor of the chamber includes a lens positioning guide, which prevents the contact lens from dissociating from the protrusion when the contact lens is fully submerged into the storage solution. In some examples, a gap between the distal end of the protrusion and the floor chamber is ten millimeters or less, five millimeters or less, <NUM> millimeter or less, another distance, or combinations thereof. Even with a small gap in place between the protrusion's distal end and the chamber's floor, the contact lens can be prone to dissociating from the distal end due to lateral forces imposed by moving the contact lens case. Other forces that can contribute to the dissociating the contact lens from the distal end of the protrusion include gravity or dynamic fluid forces when the contact lens case's orientation changes due to being carried or otherwise being moved.

The lens positioning guide engages the contact lens at a region other than the center of the contact lens to prevent the contact lens from moving laterally off of the curvature of the distal end. The lens positioning guide engages the contact lens at a periphery of the contact lens. The lens positioning guide comprises a riser configured to center a contact lens within the receiving body, the riser including a top surface, wherein the top surface is spaced a distance away from a surface of the floor. The contact lens can include a peripheral portion that is defined by an edge of the contact lens and a midpoint of the contact lens' radius. The lens positioning guide can engage the contact lens within this peripheral portion. In some cases, the lens positioning guide can include an annular surface that blocks the contact lens from moving in any direction. Alternatively, the lens positioning guide can include isolated contact points that collectively prevent the contact lens from moving laterally off of the curvature of the distal end. In some cases, the lens positioning guide can push a portion of the contact lens into the distal end of the protrusion. The distal end of the protrusion includes a circumferential lip that protrudes out and away from an edge of the distal end's curvature, and the lens positioning guide pushes an edge of the contact lens against the circumferential lip to substantially maintain the position of the contact lens on the distal end.

When the cap portion of the contact lens case is removed from the platform portion, the contact lens remains adhered to the distal end of the protrusion. Thus, the contact lens is removed from the contact lens case as the cap portion is removed from the contact lens case. This arrangement provides several advantages. First, the geometries of the upper portion and the platform portion prevent the contact lens from unwanted movement as the contact lens is removed from the case's chamber. As a result, the various surfaces of the contact lens is not subjected to the same sliding engagement with the surfaces of the chamber that conventional systems allow. Accordingly, the contact lens is less prone to being scratched as it is removed from the chamber.

Second, with the posterior side of the contact lens adhered to the surfaces of the protrusion, the anterior surface of the lens is presented to the user when the user grasps the contact lens off of the protrusion. That is, only the anterior side of the contact lens is available for contact with the user's fingers. As a result, the user can remove the contact lens from the protrusion by contacting just the anterior side of the contact lens, which allows the posterior side of the contact lens to be untouched by the user when it is removed from the protrusion to the user's eye. Consequently, germs, debris, pollutants, and other types of contaminants or undesirables from the user's hand can be isolated to the anterior side of the contact lens, which does not come into direct contact with the eye. The anterior side of the contact lens can come into contact with the user's eyelid, which is biometrically designed to clean and protect the eye. Thus, the germs, debris, pollutants, and other types of undesirables are subjected to those cleaning forces naturally imparted by the eyelid. As a result, the user is less prone to adverse effects resulting from contact lens contaminants.

Several factors can affect how adequately the contact lens adheres to the distal end of the protrusion. These factors can include the viscosity of the storage solution, the surface tension of the storage solution, the volume of storage solution within the chamber, the curvature of the protrusion's distal end, the surface roughness of the protrusion's distal end, other factors, or combinations thereof.

In some cases, the curvature of the protrusion's distal end complements the curvature of the posterior side of the contact lens. In other cases, the protrusion's distal end can include a larger radius of curvature than that of the contact lens. In both of these types of embodiments, the surface tension of the storage solution can cause the contact lens to adhere to the distal end's surface. In some cases, the distal end's radius of curvature is between <NUM> millimeters and <NUM> millimeters. In yet another example, the distal end's radius of curvature is between <NUM> millimeters and <NUM> millimeters. The curvature of the distal end can be a consistent radius of curvature such that the curvature forms part of a spherical shape. In other examples, the distal end's radius of curvature changes across the surface of the curvature. For example, the radius of curvature can be flatter towards the periphery of the curvature or flatter towards the center of the curvature.

In some cases, the distal end's radius of curvature can be larger than the radius of curvature of the contact lens. In one of these examples, the contact lens' posterior side can include a radius of curvature that is approximately <NUM> to <NUM> millimeters. In other examples, the posterior side of the contact lens can include a radius of curvature that is <NUM> millimeters or less.

Any appropriate surface roughness can be incorporated into the distal end of the protrusion. In some examples, the surface roughness average (Ra) is <NUM> micrometers or less. In another example, the surface roughness average is <NUM> micrometers or less.

Now referring to the figures, <FIG> depict an example of a contact lens case <NUM>. In this example, the contact lens case <NUM> includes a cap portion <NUM> and a platform portion <NUM>. <FIG> depicts a perspective view of the contact lens case <NUM> with the cap portion <NUM> secured to the platform portion <NUM>. <FIG> depicts a side view of the contact lens case <NUM> with the cap portion <NUM> removed from the platform portion <NUM>. <FIG> depicts a cross-sectional side view of the contact lens case <NUM> with the cap portion <NUM> secured to the platform portion <NUM>.

The platform portion <NUM> includes a receiving body <NUM> that has a substantially flat surface that provides stability to the contact lens case <NUM> when resting on a support surface, such as a counter top or sink surface. In the upright position, the contact lens case <NUM> is oriented such that the storage solution pools in the bottom of the chamber <NUM> and away from the threaded portions or other connection mechanisms that secure the cap portion <NUM> to the platform portion <NUM>. The platform portion <NUM> also includes an inner wall <NUM> that is connected to a floor <NUM>. The inner wall <NUM> and the floor <NUM> collectively define the chamber <NUM>. The chamber <NUM> is configured to receive a volume of contact lens storage solution. A contact lens can be inserted into the chamber <NUM> and be submerged in the storage solution for a desired period of time, such as overnight, until the user decides to reinsert the contact lens back into the user's eye.

Any appropriate type of storage solution can be used in connection with the principles disclosed herein. In some examples, the storage solution includes a disinfectant that kills bacteria, viruses, fungus, germs, enzymes, contaminants, undesirable organisms, or combinations thereof that are on the contact lens. In some examples, the storage solution also prevents a protein build-up, a lipid build-up, a debris build-up, or other type of build-up on the contact lens. Further, the storage solution can include ingredients that improve wettability and comfort of silicon hydrogel contact lenses. In some cases, the storage solution includes a saline solution, a hydrogen peroxide solution, another type of solution, or combinations thereof.

In some examples, the platform portion <NUM> includes a first chamber <NUM> and a second chamber <NUM>. In this example, the contact lens case <NUM> includes a first cap portion <NUM> and a second cap portion <NUM>. The first chamber <NUM> can correspond to the right contact lens, and the second chamber <NUM> can correspond to the left contact lens. This allows both contact lenses to be received and stored separately. While the examples of the contact lens cases <NUM> of <FIG> are depicted with multiple chambers, any appropriate number of chambers can be incorporated into the contact lens case <NUM> and can include the principles of the present exemplary system and method. In some examples, the contact lens case <NUM> includes just a single chamber <NUM>.

The contact lens case <NUM> can be formed through any appropriate manufacturing methodologies. In some cases, the contact lens case <NUM> is injection molded using synthetic resins, such as polypropylene (PP), polyethylene (PE), polystyrene (PS), polycarbonate (PC), polyethylene terephthalate (PET), acrylonitrile butadiene styrene copolymer (ABS), propylene ethylenic copolymer, or combinations thereof. In other examples, the contact lens case <NUM> can be casted, machined, or otherwise formed. In some cases, the cap portion <NUM> is made of the same materials as the platform portion <NUM>. Alternatively, the cap portion <NUM> can be formed of a disparate material when compared to the platform portion <NUM>.

In some cases, the platform portion <NUM> includes a first thread portion <NUM>, and the cap portion <NUM> includes a second thread portion <NUM>. In some cases, the first thread portion <NUM> is an outer thread portion, and the second thread portion <NUM> is an inner thread portion. However, in other examples, the first thread portion <NUM> can be an inner thread portion, and the second thread portion <NUM> can be an outer thread portion. The first thread portion <NUM> and the second thread portion <NUM> can be threadedly connected to one another. With the cap portion <NUM> secured to the platform portion <NUM> through the threaded portions, the cap portion <NUM> closes off the chamber <NUM>.

While these examples have been described with reference to the contact lens case <NUM> having the cap portion <NUM> and the platform portion <NUM> connected through complimentary threaded portions, the cap portion <NUM> and the platform portion <NUM> can be connected through any appropriate mechanism. For example, the cap portion <NUM> and the platform portion <NUM> can be secured together through a snap connection, a compression fit connection, an interference fit connection, a hinged connection, another type of connection, or combinations thereof. In some examples, the connection is water tight to prevent the storage solution from leaking out of the chamber <NUM> when the contact lens case <NUM> is oriented on its side or upside-down.

A protrusion <NUM> is connected to the cap body <NUM>. The protrusion <NUM> can extend farther away from the cap body <NUM> than the second threaded portion. The protrusion <NUM> includes a distal end <NUM>, and the distal end <NUM> includes a curved surface <NUM>. The contact lens can adhere to the curved surface <NUM> of the distal end <NUM> when placed on the curved surface <NUM> and when the contact lens and distal end are wetted. In the example of <FIG>, the protrusion <NUM> includes a circumferential lip <NUM> that surrounds an edge of the curved surface <NUM>. This circumferential lip <NUM> forms a lip wall <NUM> that can contribute to preventing the contact lens from sliding off of the curved surface <NUM> of the protrusion <NUM>.

A lens positioning guide <NUM> is formed in the floor <NUM> of the platform portion <NUM> of the contact lens case <NUM>. The lens positioning guide <NUM> can include a contact point configured to contact a non-center portion of the contact lens to assist in keeping the contact lens on the curved surface <NUM> of the protrusion <NUM>. In this example, the lens positioning guide <NUM> includes a guide curvature <NUM> that is configured to make contact with a peripheral portion of the contact lens. In some cases, the guide curvature is a portion of the slope of the floor <NUM> of the chamber <NUM>. The lens positioning guide <NUM> can hold the contact lens against the curved surface <NUM> in situations where fluid forces can otherwise cause the contact lens to be dislodged from the curved surface <NUM>.

In some cases, a center portion of the contact lens comes into contact with a central portion of the floor <NUM> of the chamber <NUM>. In those examples where the distance between the floor <NUM> and the distal end <NUM> or circumferential lip <NUM> of the protrusion <NUM> are less than the sagittal depth of the contact lens, the protrusion <NUM> and the floor <NUM> can collectively impose a compressive load or deforming load on the contact lens that assists in keeping the contact lens up against the curved surface <NUM>. However, due to the curvature of the distal end <NUM>, the gap between the floor <NUM> and the distal end <NUM> can progressively increase from the central portion of the floor <NUM> towards the edge of the curved surface <NUM>. In such circumstances, the contact lens can otherwise be prone to dislodging from the curved surface <NUM> if the contact lens were positioned off center on the curved surface <NUM>. In the example of <FIG>, the lens positioning guide <NUM> keeps the gap narrow along the distal end's entire curvature allowing the contact lens to be held in compression in situations where the central gap is sufficiently narrow. Also, the lens positioning guide <NUM> of <FIG> can engage the contact lens on a central location of the contact lens to assist with keeping the contact lens against the distal end <NUM>.

<FIG> depicts an example of a contact lens <NUM>. In this example, the contact lens <NUM> includes a central portion <NUM> and a peripheral portion <NUM>. In some examples, the contact lens <NUM> makes contact with the lens positioning guide <NUM> within the peripheral portion <NUM>. But, the lens positioning guide <NUM> can make contact with the contact lens <NUM> at any appropriate location including within the central portion <NUM>. In some examples, the peripheral portion <NUM> of the contact lens <NUM> can be defined by a midpoint <NUM> between the center <NUM> of the contact lens <NUM> and an edge <NUM> of the contact lens <NUM>. In the example of <FIG>, the midpoint of the contact's lens' radius <NUM> is schematically represented with the dashed circle <NUM>.

<FIG> depicts an example of a lens positioning guide <NUM> in accordance with the principles described in the present disclosure. In this example, a contact lens <NUM> is disposed between the distal end <NUM> of the protrusion <NUM> and the floor <NUM> of the case's chamber <NUM>. In the illustrated example, the lens positioning guide <NUM> is incorporated into the floor <NUM> of the case's chamber <NUM>.

In the illustrated example, the protrusion <NUM> includes a circumferential lip <NUM> encircling the curved surface <NUM> of the distal end <NUM>. The circumferential lip <NUM> forms a lip wall <NUM> that also encircles the distal end's curved surface <NUM>. The curved surface <NUM> of the distal end <NUM> can include a radius of curvature that is between <NUM> millimeters and <NUM> millimeters.

The lens positioning guide <NUM> is a recess <NUM> that is defined in the floor <NUM> of the chamber <NUM>. The recess <NUM> includes a concave curvature that makes contact with the contact lens <NUM>. In some cases, the contact lens <NUM> makes contact with the recess <NUM> just in those circumstances where the contact lens <NUM> is off-center with respect to the center of the protrusion <NUM>. In other examples, the lens positioning guide <NUM> makes contact with the peripheral portion <NUM> of the contact lens <NUM> regardless of whether the contact lens <NUM> is off-center or not. The concave curvature of the lens positioning guide <NUM> can include a central region <NUM>, a mid-peripheral region <NUM>, and a peripheral region <NUM>.

The contact lens <NUM> can include a posterior side <NUM> that has a concave curvature. The posterior side <NUM> can be placed on the cornea of the user's eye when worn by the user. The contact lens <NUM> can also include an anterior side <NUM> that has a convex curvature. The anterior side <NUM> can be separated from the posterior side <NUM> by a thickness of the contact lens <NUM> material. The posterior side <NUM> and the anterior side <NUM> are joined at an edge <NUM> of the contact lens <NUM>.

The lens positioning guide <NUM> can be shaped to make contact with the contact lens <NUM> in the central region <NUM>, the mid-peripheral region <NUM>, the peripheral region <NUM>, or combinations thereof, of the concave recess <NUM>. The contact lens <NUM> can be directed up against the lip wall <NUM> of the protrusion <NUM>. By catching the edge <NUM> of the contact lens <NUM> with the lip wall <NUM>, the contact lens <NUM> can be prevented from sliding off of the convex curved surface <NUM> of the protrusion's distal end <NUM>.

In other examples, not forming part of the present invention, the protrusion <NUM> does not include a lip wall <NUM>, and the lens positioning guide <NUM> keeps the contact lens <NUM> centered within the chamber <NUM> by contacting a peripheral region or mid-peripheral region of the contact lens <NUM>. In this example, the lens positioning guide <NUM> can keep the contact lens <NUM> adjacent to the distal end <NUM> of the protrusion <NUM> so that when the cap portion <NUM> is removed from the platform portion <NUM>, the contact lens <NUM> remains adhered to the distal end <NUM> and is removed with the cap portion <NUM>.

<FIG> depict an example of a cap portion <NUM>. In this example, the cap portion <NUM> includes a cap body <NUM> and an attachment portion. In some cases, the attachment portion includes an inner thread portion <NUM> that is configured to be threadedly secured to an outer threaded region of the platform portion <NUM>. The cap portion <NUM> also includes a protrusion <NUM> that extends from the cap body <NUM>. The attachment portion can encircle the protrusion <NUM>, and the protrusion <NUM> can extend beyond the attachment portion. In some cases, the threaded region of the platform portion <NUM> can be disposed between the protrusion <NUM> and the attachment region of the cap portion <NUM> when the cap portion is connected to the platform portion <NUM>.

<FIG> depicts a side cross-sectional view of an example of a platform portion <NUM>. In this example, the platform portion <NUM> includes a first chamber <NUM> and a second chamber <NUM>. A first leg is connected to the first chamber <NUM>, and a second leg is connected to the second chamber <NUM>. Additional legs can be secured to the platform portion <NUM> that are not visible in this particular cross section. In this example, the floor <NUM> of the chamber <NUM> includes a rounded curve connecting the inner wall <NUM> to the floor <NUM>. A recess <NUM> is formed in the floor <NUM> that forms, at least in part, the lens positioning guide <NUM>. A peripheral region <NUM> (illustrated in <FIG>) of the lens positioning guide <NUM> can make contact with a contact lens to position the contact lens against the distal end <NUM> of the protrusion <NUM> when the cap portion <NUM> is secured to the platform portion <NUM>.

<FIG> depicts an example of a platform portion <NUM>. In this example, the floor <NUM> of the chamber <NUM> includes a wider recess that forms, at least in part, the lens positioning guide <NUM>. In this example, the peripheral region <NUM> (illustrated in <FIG>) and/or the mid-peripheral region <NUM> (illustrated in <FIG>) can make contact with the contact lens.

<FIG> depicts an example of a platform portion <NUM> that includes just a single chamber <NUM>. In this example, a contact lens <NUM> is disposed within the chamber <NUM> and is in contact with the lens positioning guide <NUM>. In this example, the lens positioning guide <NUM> contacts a central and mid-peripheral region of the contact lens. The lens positioning guide <NUM> can keep the contact lens centered within the region. In this example, the floor <NUM> is shaped to form the legs of the platform portion <NUM> and the lens positioning guide <NUM>.

<FIG> depicts an example, not forming part of the present invention, of a platform portion <NUM> with a flat floor <NUM> and a recess <NUM> formed in the floor <NUM>. In this example, the floor <NUM> of the platform portion <NUM> includes a thickness that forms a flat bottom of the platform portion <NUM>, and the recess <NUM> is formed in the flat bottom of the platform portion.

<FIG> depicts an example of lens positioning guide <NUM> that includes a riser <NUM>. The riser <NUM> is a portion that is located above the floor level <NUM> of the chamber <NUM> that is configured to make contact with a peripheral portion <NUM> of the contact lens. A top portion of the riser <NUM> is spaced a distance above the floor <NUM>, and the lens positioning guide <NUM> forms a concave curve that connects the riser portion. In this example, the top portion of the riser <NUM> is rounded, but in other examples, the top portion of the riser <NUM> can be flat, pointed, stepped, asymmetric, otherwise shaped, or combinations thereof. In the illustrated example, the center of the concave curve is located below of the floor level <NUM> of the chamber <NUM>.

<FIG> depicts an example of a lens positioning guide <NUM> with risers <NUM>. In this example, the risers <NUM> are formed in the floor <NUM>, which rise above the floor level <NUM>. In this example, the chamber floor <NUM> is flat and the risers <NUM> protrude up out of the flat floor <NUM> without forming a gradual curve. The risers <NUM> can connect to the floor <NUM> without creating a continuous curve that connects the riser portions. In this example, a gap can be defined between the lens positioning guide <NUM> and the anterior side of the contact lens when the contact lens is located in the chamber <NUM>.

While the depicted examples of lens positioning guides with risers include risers with sloped sides, the risers can have any appropriate shape. For example, the risers can include a sloped side, a flat side, a stepped side, another type of side of combinations thereof. Further, the risers can include a generally triangular cross section, a generally circular cross section, a generally ovoid cross section, a generally square cross section, a generally rectangular cross section, a generally symmetric cross section an symmetric cross section, another type of cross section, or combinations thereof.

Claim 1:
A contact lens case (<NUM>), comprising:
a cap portion (<NUM>, <NUM>), the cap portion (<NUM>, <NUM>) including:
a cap body (<NUM>);
a protrusion (<NUM>) extending from the cap body (<NUM>);
a distal end of the protrusion (<NUM>);
a convex curved surface (<NUM>) formed on the distal end (<NUM>) of the protrusion (<NUM>); and
a circumferential lip (<NUM>) formed on the convex curved surface (<NUM>) that surrounds an edge of the curved surface, the circumferential lip (<NUM>) forming a lip wall (<NUM>); and
a platform portion (<NUM>) configured to be secured with the cap portion (<NUM>, <NUM>), the platform portion (<NUM>) including:
a receiving body (<NUM>);
an inner wall (<NUM>) formed in the receiving body (<NUM>);
a floor (<NUM>) connected to the inner wall (<NUM>),
the inner wall (<NUM>) and the floor (<NUM>) defining a chamber (<NUM>);
and the floor including a lens positioning guide (<NUM>) disposed in the chamber (<NUM>), the lens positioning guide (<NUM>) having a concave recess (<NUM>) configured to make contact with a contact lens; and
characterized in that the lens positioning guide (<NUM>) comprises a riser (<NUM>) configured to center a contact lens within the receiving body (<NUM>), the riser including a top surface, wherein the top surface is spaced a distance away from a surface of the floor (<NUM>).