Patent Description:
The increasing prevalence of myopia in Southeast Asian countries not only represents a potential cost factor for the healthcare system, but also entails immense costs for the economy and for individuals through the costs of purchasing corrective devices. In principle, the existing myopia can be corrected by using glasses, contact lenses, intraocular lenses or also by refractive interventions. However, research shows that this corrects the error of the refraction itself, but in many cases, especially in children, a rapid progression of the spherical portion of the refractive error is reported. It is primarily known from clinical data that refractive errors of -<NUM> diopter or higher lead to chorioretinal changes at the retinal level. Research activities to reduce the progression of myopia has examined different modes of action of interventions and clinical trials have shown different effectiveness. In the case of spectacle lenses with a continuous increase in effectiveness in the direction of the periphery along all meridians (as e.g., spectacle lenses offered from the Carl Zeiss Vision Group under the tradename MyoVision), an efficiency of <NUM> % for reducing axial length growth could be demonstrated in defined test subject groups (<NPL>). Using other optical intervention methods with spectacle lenses, far higher effectiveness of up to <NUM>% (see e.g., <NPL>). could be proven in clinical studies.

In the case of glasses-based interventions, in particular, not only good effectiveness is important, but also aesthetics and good wearability. After all, it has been shown that wearing glasses for a long time during the day leads to greater efficacy in reducing the progression of myopia.

In the case of spectacle lens interventions, the following mechanisms of action can in principle be considered.

whereby the last two mechanisms of action are partly used in unison, but the consideration according to the present invention is mainly concentrated on point <NUM> as follows.

<CIT> discloses in Fig. 14a and 14b and describes in section [<NUM>] a generic spectacle lens having a clear zone and cylindrical concentric rings. The document does not disclose any dimensions of the cylindrical concentric rings. Section [<NUM>] discloses a preferred embodiment which is characterized in that in every circular zone having a radius in a range between <NUM> and <NUM> with a geometrical center located at a distance of the optical center of the spectacle lens greater or equal to said radius + <NUM>, the ratio between the sum of areas of the parts of cylindrical concentric rings located inside said circular zone and the area of said circular zone is comprised in a range between <NUM> % and <NUM> %. Said ratio is according to <CIT> the identification number.

<CIT> shows in Fig. 11a and 11b and describes on page <NUM>, lines <NUM> to <NUM> the same type of spectacle lenses as shown in Fig. 14a and 14b and described in [<NUM>] of <CIT>. According to page <NUM> lines <NUM> to <NUM> of <CIT> describes that the identification number being defined in the same manner as indicated with respect to <CIT> above may be within the ranges of <NUM> % to <NUM> % or <NUM> % to <NUM> % or <NUM> % to <NUM> %.

Neither <CIT> nor <CIT> disclose concrete dimensions for said cylindrical concentric rings described in the foregoing.

In addition, it has been found out that a plurality of wearers of spectacle lenses with cylindrical concentric rings described above with reference to <CIT> and <CIT>, respectively, complain of discomfort.

In addition to the variant of spectacle lenses with concentric rings shown in Fig. 11a and 11b, the publication of the application <CIT> discloses a spectacle lens with a plurality of concentric rings with annularly arranged and contiguously connected lenslets. According to p. <NUM> to p. <NUM> a lenslet diameter is at least <NUM>. Identification numbers as defined on p. <NUM> of said document, namely being a ratio between the sum of areas of the parts of cylindrical concentric rings located inside said circular zone and the area of said circular zone, are targeted to be within ranges of <NUM> % and <NUM> % or <NUM> % and <NUM> % or <NUM> % and <NUM> %.

<CIT> discloses a method implemented by computer means for characterizing optical elements of a lens element adapted for a person. The lens element comprising: a holder comprising a refraction area having a refractive power based on a prescription for correcting an abnormal refraction of an eye of the person. Furthermore, the lens element comprises a plurality of optical elements configured so that at least one of slow down, retard or prevent a progress of the abnormal refraction of the eye of the person.

<CIT> relates to a flexible refractive film patch with microstructure. The film patch can be applied to all kinds of spectacle lenses. The film patch has the properties of an ordinary film patch. In addition, the film patch has a certain refractive effect. The ophthalmic lens can maintain a good refractive correction effect in the central region, and at the same time, the introduction of peripheral defocus.

<CIT> discloses sets, kits or stocks of anti-myopia contact or spectacle lenses, along with methods for their use, that do not require a clinician to measure peripheral refractive error in the eyes of myopic patients. Extensive surveys have shown that lenses having peripheral powers or defocus set in accordance with central corrective power will cover almost all normal myopes not worse than -6D central refractive error. Sets, kits and stocks, as well as examples of lenses themselves, are disclosed together with methods of use.

<CIT> relates to micro lenses arrayed onto a single vision spectacle lens. The set of diffusing dots may be micro lenses, which are typically on the order of a tenth of a millimeter in diameter to about <NUM> millimeter in diameter, and about <NUM> micron in height. Refractive power is at the center of the lens, while the micro lenses form an array as the specific pattern.

<CIT>, on which the present invention is based, discloses in <FIG> a spectacle lens with a central optical region. Said central optical region is a circular region within a specified radius being equal to <NUM>. Outside of the central optical region, microstructures are arranged in a ring-shaped manner. The radial widths of the microstructures are specified in a range of <NUM> to <NUM>.

Some wearers of spectacle lenses with large lenslet diameter report of optical discomfort.

Therefore, it is an object of the present invention to present a spectacle lens providing a well balance between the wearability of the spectacle lens and the reduction of progression of myopia. Moreover, the manufacturing of the inventive spectacle lens comprising ring-shaped focusing structure should be ensured.

The problem is solved by a spectacle lens according to claim <NUM>.

<CIT>, on which the present invention is also based, discloses in <FIG> a spectacle lens with a central optical region. Outside of the central optical region, diffusing structures are arranged.

Some wearers of spectacle lenses with large diffusing structures report of optical discomfort.

Therefore, it is an object of the present invention to present a spectacle lens providing a well balance between the wearability of the spectacle lens and the reduction of progression of myopia. Moreover, the manufacturing of the inventive spectacle lens comprising ring-shaped diffusing structure should be ensured.

Advantageous embodiments and developments of the invention are the subject matter of the dependent claims.

The spectacle lens according to the invention comprises a plurality of ring-shaped focusing structures or a plurality of ring-shaped diffusing structures each having a respective width, and
a central clear zone having a central clear zone width within a range of <NUM> to <NUM> and said width being equal to or lower than <NUM>;.

A spectacle lens in the context of the present invention is an ophthalmic lens worn in front of, but not in contact with, the eyeball (DIN ISO <NUM>:<NUM>, section <NUM>. <NUM>), where an ophthalmic lens is a lens intended to be used for purposes of measurement, correction and/or protection of the eye, or for changing its appearance (DIN ISO <NUM>:<NUM>, section <NUM>.

A structure shall be considered as ring-shaped if it surrounds a structure-free zone and there is a path within the structure which runs from a starting point within the structure around the structure-free zone and to the starting point again.

In the context of the present specification, the term "ring-shaped focusing structures" applies to structures providing a ring-shaped focal line as well as to structures comprising a plurality of lenslets adjoining each other such, that they form a ring of contiguously connected lenslets and providing a plurality of (e.g., equidistantly arranged and preferably mainly line-shaped or point-shaped) foci along a ring-shaped line. The term "ring shaped focusing structures" also comprises a cylindrical shape in the cross-section of the "ring shaped focusing structures" as shown in Fig. 14a and Fig. 14b and described in sections [<NUM>] of <CIT>. In other words, the term "ring shape focusing structures" also corresponds to a part of pure cylindrical concentric rings.

A structure providing a ring-shaped focal line is e.g., shown in Fig. 14a and Fig. 14b and described in sections [<NUM>] of <CIT> as well as in Fig 11a and 11b, page <NUM>, lines <NUM>-<NUM> of <CIT>, respectively. Other variants of such structures providing a ring-shaped focal line are disclosed in <FIG> of <CIT>, in Fig. 5A and Fig. 5B of <CIT>.

In front view, i.e., if viewed perpendicular onto the front surface of the spectacle lens, the ring does not need to be circular, but also non-circular, in particular elliptical or otherwise curved rings such as e.g., shown in <FIG> of <CIT>, are possible.

The lenslets do not need to be circular lenslets if viewed from the front view as described in the following. Exemplarily, such ring-shaped focusing structures may e.g., comprise structures similar to those described in <CIT>, p. <NUM> with reference to <FIG> shown therein.

In the context of the present invention, the term "lenslet" refers either to a small convex structure in the approximately spherical, ellipsoidal, sinusoidal or similar shape of a lens that is provided on a surface of a spectacle lens and has lateral dimensions that are several orders of magnitude smaller than the dimensions of the spectacle lens itself, or to a small area with a refractive index distribution that is provided in a spectacle lens body where the refractive index distribution has lateral dimensions that are at least a plurality of orders of magnitude smaller than the dimensions of the spectacle lens itself.

In case of the lenslets being small convex structures, lenslets are considered to adjoin each other in case there is a path between the centers of two lenslets that does not pass an area having solely the shape of the surface on which the lenslets are formed. In case of the lenslets being refractive index distributions, lenslets are considered to adjoin each other in case there is a path between the centers of two lenslets that does not pass an area having the refractive index of the spectacle lens body.

In optics, diffusing structures (also called a light diffuser or optical diffuser) constitute an optical element that is made of any material that diffuses or scatters light in some manner to transmit soft light. Diffuse light can be easily obtained by reflecting light from a white surface, while more compact diffusing structures may use translucent material, including ground glass, Teflon, holographs, opal glass, and greyed glass. Scattering may be achieved by scattering centers which may be point-shaped, examples of which are, e.g., disclosed in <CIT>, <CIT>, <CIT> and <CIT>, respectively.

The term "width of a ring-shaped focusing structure" designates an expansion of a ring-shaped focusing structure perpendicular to its circumferential direction as measured from its inner and outer onsets. Analogously, "width of a ring-shaped diffusing structure" designates an expansion of a ring-shaped diffusing structure perpendicular to its circumferential direction as measured from its inner and outer onsets. The term "onset" represents the first measurable position of a ring-shaped focusing structure or a ring-shaped diffusing structure on a surface of a spectacle lens. In other words, the term "onset" represents a position on the surface of the spectacle lens on which the surface shape starts to deviate from the shape of the base lens surface in case of the focusing structures or on which the contrast-reducing properties of the lens change with respect to the base lens in case of the diffusing structures. Exemplary embodiments of determining the onset are shown in <FIG>, <FIG> and <FIG>. Further, the term "inner onset" specifies the onset on the side of the structure towards the center of the lens and the term "outer onset" specifies the onset of the structure away from the lens towards the periphery.

In the context of the present specification, the term "clear zone" applies to a structure-free zone of a spectacle lens. It is designed such that it shall neither provide a myopic defocus nor a diffusion in foveal vision when a wearer looks through the clear zone with the spectacle lens being positioned according the specified as-worn position. Furthermore, a clear zone may allow for achieving, if required assisted by accommodation, a focused image on the fovea.

A central clear zone is a structure-free zone which is neighbored and surrounded by a ring-shaped focusing structure.

The optical center (DIN ISO <NUM>:<NUM>, section <NUM>. <NUM>) of a single vision lens in general is located within the central clear zone. Progressive spectacle lenses may comprise more than one, in particular two central clear zones located e.g., in near portion (DIN ISO <NUM>:<NUM>, Sec. <NUM>) and far portion (DIN ISO <NUM>:<NUM>, section <NUM>.

A "clear zone width" is a maximum expansion of the onset of the innermost ring-shaped focusing structure or as the case may be a maximum expansion of the onset of the innermost ring-shaped diffusing structure.

A central clear zone with a central clear zone width within a range of <NUM> to <NUM> has the advantage that a small clear zone e.g., <NUM> increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. At the same time said small clear zone decreases the acceptance of the spectacle lens by the wearer due to the decreased comfort of wearability of the spectacle lens. A large clear zone e.g., <NUM> decreases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. At the same time said large clear zone increases the acceptance of the spectacle lens by the wearer due to the increased comfort of wearability of the spectacle lens.

The term "fill factor" must be subdivided into "length-based fill factor" and "surface-based fill factor". The length-based fill factor is used for determining the fill factor of a circular-shaped focusing or diffusing structure. Whereas the surface-based fill factor is used for determining the fill factor of a ring-shaped focusing or diffusing structure.

The length-based fill factor is defined as the ratio of the width of the inner circular-shaped focusing structure adjacent to a clear zone ("width") and the radial distance between the inner circular-shaped focusing structure and the neighboring circular-shaped focusing structure ("pitch"): <MAT>.

A "pitch" is a distance between an onset of two neighboring circular-shaped focusing or diffusing structures.

The length-based fill-factor has the advantage to define the balance between the wearability and the manufacturing of the inventive spectacle lens comprising circular-shaped focusing or diffusing structures. A length-based fill factor greater than <NUM> % results in a decrease of comfortable wearability of the spectacle lens but increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. A length-based fill factor smaller than <NUM> % results in a decrease of the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer but increases the comfortable wearability of the spectacle lens. In other words, a well-defined balance between the wearability and the manufacturing of the inventive spectacle lens is achieved with a length-based fill factor in the range of <NUM> % to <NUM> %. In particular, a length-based fill factor of <NUM> % is preferred.

The surface-based fill factor is determined by the surface area ratio of the surface area of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure and a sum of said surface area of said innermost one or more ring-shaped focusing structure or said innermost one or more ring-shaped diffusing structure and the area of a peripheral clear zone. The term "innermost" describes the closest ring-shaped focusing structure or ring-shaped diffusing structure to the central clear zone. The term "peripheral clear zone" refers to the first clear zone next to central clear zone.

The surface area of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure is determined by an inner onset line and an outer onset line of said innermost one or more ring-shaped focusing structure or said innermost one or more ring-shaped diffusing structure. The inner onset line passes along the inner onset of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure, said inner onset line surrounds the central clear zone. The outer onset line passes along the outer onset of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure, said outer onset line is surrounded by the peripheral clear zone. The inner onset line and the outer onset line of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure are enclosing a surface area along the surface of the base spectacle lens without structures, said surface area is the surface area of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure.

The surface area of the peripheral clear zone is determined by the outer onset line of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure and the inner onset line of a neighboring one or more ring-shaped focusing structure or a neighboring one or more ring-shaped diffusing structure. The inner onset line of the neighboring one or more ring-shaped focusing structure or the neighboring one or more ring-shaped diffusing structure passes along the inner onset of the neighboring one or more ring-shaped focusing structure or neighboring one or more ring-shaped diffusing structure, said inner onset line surrounds the peripheral clear zone.

The outer onset line of the innermost one or more ring-shaped focusing structure or the innermost one or more ring-shaped diffusing structure and the inner onset line of the neighboring one or more ring-shaped focusing structure or the neighboring one or more ring-shaped diffusing structure enclosing a surface area along the spectacle lens, said surface area is the surface area of the peripheral clear zone. The surface-based fill-factor has the advantage to define the balance between the wearability and the manufacturing of the inventive spectacle lens comprising ring-shaped focusing or diffusing structures. A surface-based fill factor greater than <NUM>% results in a decrease of comfortable wearability of the spectacle lens but increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. A surface-based fill factor smaller than <NUM>% results in a decrease of the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer but increases the comfortable wearability of the spectacle lens. According to the invention, a well-defined balance between the wearability and the manufacturing of the inventive spectacle lens is achieved with a surface-based fill factor in the range of <NUM>% to <NUM>% or of <NUM>% to <NUM>%.

The above described problem is fully solved by a spectacle lens described in the forgoing. Since the intended wearers are children, the higher level of comfort and wearability prevent the children from removing the spectacle lenses.

Preferred embodiments of a spectacle lens designed according to the inventive concept may be characterized in that said width(s) of said ring-shaped focusing structures or said ring-shaped diffusing structures is (are) within at least one range of the following group of ranges:.

The advantage consists in a well-defined balance between the wearability and the manufacturing of the inventive spectacle lens. A decrease of the width of a ring-shaped structure leads to a more comfortable wearability of the spectacle lens. An increase of the width of a ring-shaped structure enables easier manufacturing of the spectacle lens.

In another preferred embodiment of the invention the spectacle lens is characterized having a central clear zone width within at least one range of the following group of ranges:.

A central clear zone with a central clear zone width within a range of <NUM> to <NUM> has the advantage that a small clear zone e.g., <NUM> increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. At the same time said small clear zone decreases the acceptance of the spectacle lens by the wearer due to the decreased comfort of wearability of the spectacle lens. A central clear zone with a central clear zone width within a range of <NUM> to <NUM> has the advantage that a large clear zone e.g., <NUM> increases the acceptance of the spectacle lens by the wearer due to the increased comfort of wearability of the spectacle lens.

Another advantageous embodiment of a spectacle lens according to the present invention is characterized in that said one or more ring-shaped focusing structures provide an additional power as compared to said central clear zone within at least one range of the following group of ranges:.

In the context of the present specification, the term "additional power" applies to a focal power that is added to the focal power of a spectacle lens in at least one meridian, where the focal power of a spectacle lens provides, assisted by accommodation, a focused image on the fovea and the additional power, when added to the focal power of a spectacle lens, provides for a myopic defocus. The additional power must not be confused with the addition power of a progressive addition lens.

The term "Focal power" is a collective term for the spherical vertex power, which brings a paraxial pencil of parallel light to a single focus (and which is usually considered in the prescription by the "sphere" value or, abbreviated, "sph", and the cylindrical vertex power of a spectacle lens, which brings a paraxial pencil of parallel light to two separate line foci mutually at right angles (DIN ISO <NUM>:<NUM>, section <NUM>. <NUM>) and which is usually considered in the prescription by the "cylinder" value or, abbreviated, "cyl".

The advantage of this further advantageous embodiment is to define the balance between the wearability and the manufacturing of the inventive spectacle lens. An additional power between <NUM> and <NUM> diopter increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. An additional power between <NUM> and <NUM> diopter increases the comfortable wearability of the spectacle lens. In other words, a well-defined balance between the wearability and the manufacturing of the inventive spectacle lens is achieved with an additional power in the range of <NUM> diopter to <NUM> diopter. In particular an additional power of <NUM> diopter is preferred.

The spectacle lens according to the invention is also in the form of computer-readable data and of a data carrier signal as defined in claims <NUM> and <NUM>, respectively.

The invention also concerns a data carrier according to claim <NUM>.

The invention will be described exemplarily in the following with reference to the drawings.

A first exemplary embodiment of the present invention is described with respect to <FIG> which show a single vision spectacle lens <NUM>. The single vision spectacle lens <NUM> comprises a central clear zone <NUM>. The central clear zone <NUM> in this embodiment has a focal power being designed for the correction of an existing myopia of the wearer. In the present exemplary embodiment, the single vision spectacle lens <NUM> comprises additionally five circular-shaped focusing structures <NUM> to <NUM> of equal cross-section. Circular-shaped means ring-shaped with a circular contour in front view.

The circular-shaped focusing structures <NUM> to <NUM> are formed such that an additional focal power of <NUM> diopters is provided as compared to the focal power of the central clear zone <NUM>. This additional focal power is recognized by the wearer as blur and is demonstrated e.g. in Li X, Ding C, Li Y, Lim EW, Gao Y, Fermigier B, Yang A, Chen H, Bao J. Influence of Lenslet Configuration on Short-Term Visual Performance in Myopia Control Spectacle Lenses. Frontiers in Neuroscience <NUM>. This additional focal power leads to a reduction of progression of myopia of the wearer.

The single vision spectacle lens <NUM> shown in <FIG> has a diameter of <NUM>. Therefore, the lens <NUM> of <FIG> requires an edging process in order, to fit into a respective spectacle frame. The single vision spectacle lens <NUM> comprises five circular-shaped focusing structures <NUM> to <NUM>. Said circular-shaped focusing structures <NUM> to <NUM> are concentrically arranged towards the optical center of the single vision spectacle lens <NUM>. Moreover, the circular-shaped focusing structure <NUM> is surrounding the central clear zone <NUM> having a circular central clear zone width cw110 of <NUM>. The width w101 of the circular-shaped focusing structure <NUM> is <NUM>. The neighboring circular-shaped structure <NUM> is arranged concentrically to the inner circular-shaped structure <NUM>, encircling the circular central clear zone <NUM>, with a pitch p101 of <NUM>. The ratio of the width w101 and the pitch p101 results in a length-based fill factor of <NUM>% and a surface-based fill factor of <NUM>%.

<FIG> shows a cross-sectional view of the single vision spectacle lens <NUM>. The front surface <NUM> and the back surface <NUM> of the single vision spectacle lens <NUM> are spherically shaped. Within the scope of this invention the shape of the front surface <NUM> and the back surface <NUM> of the single vision spectacle lens <NUM> is not limited to a spherical shape, it also can be of aspherical, toroidal, atoric or even be freely formed in order to comply with wearer's individual needs.

<FIG> demonstrates how to determine the inner onset io101 of a circular-shaped focusing structure <NUM> and the outer onset oo101 of a circular-shaped focusing structure <NUM>, the width of a circular-shaped focusing structure w101 to w103, the pitch of two neighboring circular-shaped focusing structures p101 and the central clear zone width cw110. For simplicity reasons only the three circular-shaped focusing structures <NUM> to <NUM> are shown in <FIG> compared to the five circular-shaped focusing structures <NUM> to <NUM> shown in <FIG>.

The determination of an inner onset and an outer onset of a circular-shaped focusing structure is explained exemplary for the circular-shaped focusing structure <NUM>. The inner onset io101 of the circular-shaped focusing structure <NUM> is a point directly adjacent to the central clear zone <NUM>. The outer onset oo101 of the circular-shaped focusing structure <NUM> is a point radially arranged to the inner onset io101 and directly adjacent to the peripheral clear zone <NUM>.

The width w101 of the circular-shaped focusing structure <NUM> is the radial distance between the inner onset io101 and the outer onset oo101. The width w102 and w103 are determined accordingly with the inner onsets io102, io103 and the outer onsets oo102, oo103.

The pitch p101 of the circular-shaped focusing structure <NUM> is the radial distance between the inner onset io101 of the circular-shaped focusing structure <NUM> and the inner onset io102 of the circular-shaped focusing structure <NUM>. The pitch w102 is determined accordingly with the inner onsets io102 and io103.

The central clear zone width cw110 of the single vision spectacle lens <NUM> is the diameter of the central clear zone <NUM>.

The single vision lens <NUM> according to the first embodiment of <FIG> discloses a central clear zone width cw110 which results in a better acceptance response of the wearer compared to the prior-art. Moreover, the length-based fill factor If101 and the pitch p101 are designed such that, compared to the prior-art, a better comfort and acceptance response of the wearer is achieved.

A second exemplary embodiment of the present invention is described with respect to <FIG> which show a coated single vision spectacle lens <NUM>. The coated single vision spectacle lens <NUM> comprises a coated central clear zone <NUM>. The coated central clear zone <NUM> in this embodiment has a focal power being designed for the correction of an existing myopia of the wearer. In the present exemplary embodiment, the coated single vision spectacle lens <NUM> comprises additional five coated circular-shaped focusing structures <NUM> to <NUM> of equal cross-section. Circular-shaped means ring-shaped with a circular contour if viewed from front.

The coated circular-shaped focusing structures <NUM> to <NUM> are formed such that an additional focal power of <NUM> diopters is provided as compared to the focal power of the coated central clear zone <NUM>. This additional focal power is recognized by the wearer as blur and is demonstrated e.g., in <NPL>. This additional focal power leads to a reduction of progression of myopia of the wearer.

The coated single vision spectacle lens <NUM> shown in <FIG> has a diameter of <NUM>. Therefore, the lens <NUM> of <FIG> requires an edging process in order, to fit into a respective spectacle frame. The coated single vision spectacle lens <NUM> comprises five coated circular-shaped focusing structures <NUM> to <NUM>. Said coated circular-shaped focusing structures <NUM> to <NUM> are concentrically arranged towards the optical center of the coated single vision spectacle lens <NUM>. Moreover, the coated circular-shaped focusing structure <NUM> is surrounding the coated central clear zone <NUM> having a coated circular central clear zone width cw210 of <NUM>. The width w201 of the coated circular-shaped focusing structure <NUM> is <NUM>. The neighboring coated circular-shaped structure <NUM> is arranged concentrically to the inner coated circular-shaped structure <NUM>, encircling the coated circular central clear zone <NUM>, with a pitch p201 of <NUM>. The ratio of the width w201 and the pitch p201 results in a length-based fill factor of <NUM>% and a surface-based fill factor of <NUM>%.

<FIG> shows a cross-sectional view of the coated single vision spectacle lens <NUM>. The coated front surface <NUM> and the back surface <NUM> of the single vision spectacle lens <NUM> are spherically shaped. Within the scope of this invention the shape of the coated front surface <NUM> and the back surface <NUM> of the coated single vision spectacle lens <NUM> is not limited to a spherical shape, it also can be of aspherical, toroidal or even be freely formed in order, to comply with wearer's individual needs.

<FIG> demonstrates how to determine the inner onset io201 of a coated circular-shaped focusing structure <NUM> and the outer onset oo201 of a coated circular-shaped focusing structure <NUM>, the width of a coated circular-shaped focusing structure w201 to w203, the pitch of two neighboring circular-shaped focusing structures p201 and the central clear zone width cw210. For simplicity reasons only the three coated circular-shaped focusing structures <NUM> to <NUM> are shown in <FIG> compared to the shown five coated circular-shaped focusing structures <NUM> to <NUM> in <FIG>.

The determination of an inner onset and an outer onset of a coated circular-shaped focusing structure is explained exemplary for the coated circular-shaped focusing structure <NUM>. The inner onset io201 of the coated circular-shaped focusing structure <NUM> represents the first measurable inner position (measured from the optical center of the spectacle lens) of the coated ring-shaped focusing structure <NUM> on the surface of the spectacle lens. In other words, the inner onset io201 represents the position on the surface of the spectacle lens on which the surface shape of the coated focusing structure starts to deviate from the shape of the base lens surface. In <FIG> said first deviation and thus the inner onset io201 is at the point when the coating <NUM> is not parallel anymore to the shape of the front surface <NUM>.

The outer onset oo201 of the coated circular-shaped focusing structure <NUM> represents the first measurable outer position (measured from the optical center of the spectacle lens) of the coated ring-shaped focusing structure <NUM> on the surface of a spectacle lens. In other words, the outer onset oo201 represents the position on the surface of the spectacle lens on which the surface shape of the coated focusing structure starts to deviate from the shape of the base lens surface. In <FIG> said first deviation and therefore also the outer onset oo201 is at the point when the coating <NUM> is parallel to the shape of the front surface <NUM>.

The width w201 of the coated circular-shaped focusing structure <NUM> is the radial distance between the inner onset io201 and the outer onset oo201. The width w202 and w203 are determined accordingly with the inner onsets io202, io203 and the outer onsets oo202, oo203.

The pitch p201 of the coated circular-shaped focusing structure <NUM> is the radial distance between the inner onset io201 of the coated circular-shaped focusing structure <NUM> and the inner onset io202 of the coated circular-shaped focusing structure <NUM>. The pitch w202 is determined accordingly with the inner onsets io202 and io203.

The central clear zone width cw210 of the coated single vision spectacle lens <NUM> is the diameter of the coated central clear zone <NUM>.

The coated single vision lens <NUM> according to the first embodiment of <FIG> discloses a central clear zone width cw210 which results in a better acceptance response of the wearer compared to the prior-art. Moreover, the length-based fill factor If201 and the pitch p201 are designed such that compared to the prior-art a better comfort and acceptance response of the wearer is achieved.

A third exemplary embodiment of the present invention is described with respect to <FIG> which show a single vision spectacle lens <NUM>. The single vision spectacle lens <NUM> comprises a central clear zone <NUM>. The central clear zone <NUM> in this embodiment has a focal power being designed for the correction of an existing myopia of the wearer. In the present exemplary embodiment, the single vision spectacle lens <NUM> comprises additional five circular-shaped diffusing structures <NUM> to <NUM> of equal cross-section. Circular-shaped means ring-shaped with a circular contour if viewed from front.

The circular-shaped diffusing structures <NUM> to <NUM> are formed such that the visual acuity of the wearer is reduced by <NUM> to <NUM> logMAR. Hence, said circular-shaped diffusing structures <NUM> to <NUM> lead to a diffusion and/or scattering of light.

The single vision spectacle lens <NUM> shown in <FIG> has a diameter of <NUM>. Therefore, the lens <NUM> of <FIG> requires an edging process in order, to fit into a respective spectacle frame. The single vision spectacle lens <NUM> comprises five circular-shaped diffusing structures <NUM> to <NUM>. Said circular-shaped diffusing structures <NUM> to <NUM> are concentrically arranged towards the optical center of the single vision spectacle lens <NUM>. Moreover, the circular-shaped diffusing structure <NUM> is surrounding the central clear zone <NUM> having a circular central clear zone width cw310 of <NUM>. The width w301 of the circular-shaped diffusing structure <NUM> is <NUM>. The neighboring circular-shaped structure <NUM> is arranged concentrically to the inner circular-shaped structure <NUM>, encircling the circular central clear zone <NUM>, with a pitch p301 of <NUM>. The ratio of the width w301 and the pitch p301 results in a length-based fill factor of <NUM>% and a surface-based fill factor of <NUM>%.

<FIG> shows a cross-sectional view of the single vision spectacle lens <NUM>. The front surface <NUM> and the back surface <NUM> of the single vision spectacle lens <NUM> are spherically shaped. Within the scope of this invention the shape of the front surface <NUM> and the back surface <NUM> of the single vision spectacle lens <NUM> is not limited to a spherical shape, it also can be of aspherical, toroidal, atoric or even be freely formed in order, to comply with wearer's individual needs.

<FIG> demonstrates how to determine the inner onset io301 of a circular-shaped diffusing structure <NUM> and the outer onset oo301 of a circular-shaped diffusing structure <NUM>, the width of a circular-shaped diffusing structure w301 to w303, the pitch of two neighboring circular-shaped diffusing structures p301 and the central clear zone width cw310. For simplicity reasons only the three circular-shaped diffusing structures <NUM> to <NUM> are shown in <FIG> compared to the shown five circular-shaped diffusing structures <NUM> to <NUM> in <FIG>.

The determination of an inner onset and an outer onset of a circular-shaped diffusing structure is explained exemplary for the circular-shaped diffusing structure <NUM>. The inner onset io301 of the circular-shaped diffusing structure <NUM> is a point directly adjacent to the central clear zone <NUM>. The outer onset oo301 of the circular-shaped diffusing structure <NUM> is a point radially arranged to the inner onset io301 and directly adjacent to the peripheral clear zone <NUM>.

The width w301 of the circular-shaped diffusing structure <NUM> is the radial distance between the inner onset io301 and the outer onset oo301. The width w302 and w303 are determined accordingly with the inner onsets io302, io303 and the outer onsets oo302, oo303.

The pitch p301 of the circular-shaped diffusing structure <NUM> is the radial distance between the inner onset io301 of the circular-shaped diffusing structure <NUM> and the inner onset io302 of the circular-shaped diffusing structure <NUM>. The pitch w302 is determined accordingly with the inner onsets io302 and io303.

The central clear zone width cw310 of the single vision spectacle lens <NUM> is the diameter of the central clear zone <NUM>.

The single vision lens <NUM> according to the third embodiment of <FIG> discloses a central clear zone width cw310 which results in a better acceptance response of the wearer compared to the prior-art. Moreover, the length-based fill factor If301 and the pitch p301 are designed such that compared to the prior-art, a better comfort and acceptance response of the wearer is achieved.

A fourth exemplary embodiment of the present invention is described with respect to <FIG> which shows a single vision spectacle lens <NUM>. The single vision spectacle lens <NUM> comprises a central clear zone <NUM>. The central clear zone <NUM> in this embodiment has a focal power being designed for the correction of an existing myopia of the wearer. In the present exemplary embodiment, the single vision spectacle lens <NUM> comprises additional five circular-shaped focusing structures <NUM> to <NUM> of equal cross-section. Circular-shaped means ring-shaped with a circular contour if viewed from front.

The circular-shaped focusing structures <NUM> to <NUM> are formed such that an additional focal power of <NUM> diopters is provided as compared to the focal power of the central clear zone <NUM>. This additional focal power is recognized by the wearer as blur and is demonstrated e.g., in <NPL>. This additional focal power leads to a reduction of progression of myopia of the wearer.

The single vision spectacle lens <NUM> shown in <FIG> has a diameter of <NUM>. Therefore, the lens <NUM> of <FIG> requires an edging process in order, to fit into a respective spectacle frame. The single vision spectacle lens <NUM> comprises five circular-shaped focusing structures <NUM> to <NUM>. Said circular-shaped focusing structures <NUM> to <NUM> are concentrically arranged towards the optical center of the single vision spectacle lens <NUM>. Moreover, the circular-shaped focusing structure <NUM> is surrounding the central clear zone <NUM> having a circular central clear zone width cw410 of <NUM>. The width w401 of the circular-shaped focusing structure <NUM> is <NUM>. The neighboring circular-shaped structure <NUM> is arranged concentrically to the inner circular-shaped structure <NUM>, encircling the circular central clear zone <NUM>, with a pitch p401 of <NUM>. The ratio of the width w401 and the pitch p401 results in a length-based fill factor of <NUM>% and a surface-based fill factor of <NUM>%.

The single vision lens <NUM> according to the fourth embodiment of <FIG> discloses a wider central clear zone width cw410 compared to central clear zone width cw110 of the first embodiment of <FIG>, which results in a better acceptance response of the wearer. Moreover, the length-based fill factor lf401 and the pitch p401 are designed such that compared to the first embodiment of <FIG>, a better comfort and acceptance response of the wearer is achieved.

A fifth example not falling under the scope of the claimed invention is described with respect to <FIG> which shows a single vision spectacle lens <NUM>. The single vision spectacle lens <NUM> comprises a central clear zone <NUM>. The central clear zone <NUM> in this example has a focal power being designed for the correction of an existing myopia of the wearer. In the present example, the single vision spectacle lens <NUM> comprises additional five circular-shaped focusing structures <NUM> to <NUM> of equal cross-section. Circular-shaped means ring-shaped with a circular contour if viewed from front.

The single vision spectacle lens <NUM> shown in <FIG> has a diameter of <NUM>. Therefore, the lens <NUM> of <FIG> requires an edging process in order, to fit into a respective spectacle frame. The single vision spectacle lens <NUM> comprises five circular-shaped focusing structures <NUM> to <NUM>. Said circular-shaped focusing structures <NUM> to <NUM> are concentrically arranged towards the optical center of the single vision spectacle lens <NUM>. Moreover, the circular-shaped focusing structure <NUM> is surrounding the central clear zone <NUM> having a circular central clear zone width cw510 of <NUM>. The width w501 of the circular-shaped focusing structure <NUM> is <NUM>. The neighboring circular-shaped structure <NUM> is arranged concentrically to the inner circular-shaped structure <NUM>, encircling the circular central clear zone <NUM>, with a pitch p501 of <NUM>. The ratio of the width w501 and the pitch p501 results in a length-based fill factor of <NUM>% and a surface-based fill factor of <NUM>%.

The single vision lens <NUM> according to the example of <FIG> discloses a wider central clear zone width cw510 compared to central clear zone width cw110 of the first embodiment of <FIG>, which results in a better acceptance response of the wearer. Moreover, the length-based fill factor If501 and the pitch p501 are designed such that compared to the first embodiment of <FIG> a better comfort and acceptance response of the wearer is achieved.

A sixth example not falling under the scope of the claimed invention is described with respect to <FIG> which shows a single vision spectacle lens <NUM>. The single vision spectacle lens <NUM> comprises a central clear zone <NUM>. The central clear zone <NUM> in this example has a focal power being designed for the correction of an existing myopia of the wearer. In the present example, the single vision spectacle lens <NUM> comprises additional five circular-shaped focusing structures <NUM> to <NUM> of equal cross-section. Circular-shaped means ring-shaped with a circular contour if viewed from front.

The single vision spectacle lens <NUM> shown in <FIG> has a diameter of <NUM>. Therefore, the lens <NUM> of <FIG> requires an edging process in order, to fit into a respective spectacle frame. The single vision spectacle lens <NUM> comprises five circular-shaped focusing structures <NUM> to <NUM>. Said circular-shaped focusing structures <NUM> to <NUM> are concentrically arranged towards the optical center of the single vision spectacle lens <NUM>. Moreover, the circular-shaped focusing structure <NUM> is surrounding the central clear zone <NUM> having a circular central clear zone width cw610 of <NUM>. The width w601 of the circular-shaped focusing structure <NUM> is <NUM>. The neighboring circular-shaped structure <NUM> is arranged concentrically to the inner circular-shaped structure <NUM>, encircling the circular central clear zone <NUM>, with a pitch p601 of <NUM>. The ratio of the width w601 and the pitch p601 results in a length-based fill factor of <NUM>% and a surface-based fill factor of <NUM>%.

The single vision lens <NUM> according to the example of <FIG> discloses a narrower central clear zone width cw610 compared to central clear zone width cw110 of the first embodiment of <FIG>, which results in smaller area for myopia correction. However, the length-based fill factor If601 and the pitch p601 are designed such that compared to the first embodiment of <FIG>, a better comfort and acceptance response of the wearer is achieved.

Another example not falling under the scope of the claimed invention is described with respect to <FIG> which shows a progressive spectacle lens <NUM>. The progressive spectacle lens <NUM> comprises a distance portion <NUM>, a corridor <NUM> and a near portion <NUM>. <FIG> shows circular-shaped focusing structures <NUM> to <NUM> in the distance portion <NUM> as well as circular-shaped focusing structures <NUM> and <NUM> in the near portion <NUM>.

The distance portion <NUM> comprises four circular-shaped focusing structures <NUM> to <NUM>. Said structures are concentrically arranged towards the distance reference point <NUM>. The distance reference point <NUM> is the point on the front surface of the spectacle lens at which the verification power <NUM> for the distance portion <NUM> applies (DIN ISO <NUM>:<NUM>, section <NUM>. The verification power <NUM> is the dioptric power of the lens, specifically calculated and provided by the manufacturer as the reference for verification (DIN ISO <NUM>:<NUM>, section <NUM>. Moreover, the circular-shaper structure <NUM> is surrounding the central clear zone <NUM> which comprises a central clear zone width cw710 of <NUM>. The width w701 of the circular-shaper structure <NUM> corresponds to <NUM>. The neighboring circular-shaper structure <NUM> is arranged concentrically to the circular-shaper structure <NUM> with a pitch p701 of <NUM>. The pitch p701 is the distance from the inner onset of circular-shaper structure <NUM> to the inner onset of the circular-shaper structure <NUM>. The ratio of the width w701 and the pitch p701 results in a length- based fill factor If701 of <NUM>% and a surface-based fill factor of <NUM>%.

The near portion <NUM> comprises two circular-shaped focusing structures <NUM> and <NUM>. Said structures are concentrically arranged towards the near reference point <NUM>. The near reference point <NUM> is the point on the front surface of the spectacle lens at which the verification power <NUM> for the near portion <NUM> applies (DIN ISO <NUM>:<NUM>, section <NUM>. The verification power <NUM> is the dioptric power of the lens, specifically calculated and provided by the manufacturer as the reference for verification (DIN ISO <NUM>:<NUM>, section <NUM>. Moreover, the circular-shaper structure <NUM> is surrounding the central clear zone <NUM> which comprises a central clear zone width cw711 of <NUM>. The width w711 of the circular-shaper structure <NUM> corresponds to <NUM>. The neighboring circular-shaper structure <NUM> is arranged concentrically to the circular-shaper structure <NUM> with a pitch p711 of <NUM>. The pitch p711, is the distance from the inner onset of circular-shaper structure <NUM> to the inner onset of the circular-shaper structure <NUM>. The ratio of the width w711 and the pitch p711 results in a length-based fill factor If711 of <NUM>% and a surface-based fill factor of <NUM>%.

Another example not falling under the scope of the claimed invention is described with respect to <FIG> which shows a single vision spectacle lens <NUM>. The single vision spectacle lens <NUM> comprises a central clear zone <NUM>. The central clear zone <NUM> in this example has a focal power being designed for the correction of an existing myopia of the wearer. In the present example, the single vision spectacle lens <NUM> comprises additional five circular-shaped focusing structures <NUM> to <NUM>. Circular-shaped means ring-shaped with a circular contour if viewed from front. In this embodiment the circular-shaped focusing structures <NUM> to <NUM> comprises single lenslets which are connected to each other within one circular-shaped focusing structure <NUM> to <NUM>.

The single vision spectacle lens <NUM> shown in <FIG> has a diameter of <NUM>. Therefore, the lens <NUM> of <FIG> requires an edging process in order, to fit into a respective spectacle frame. The single vision spectacle lens <NUM> comprises five circular-shaped focusing structures <NUM> to <NUM>. Said circular-shaped focusing structures <NUM> to <NUM> are concentrically arranged towards the optical center of the single vision spectacle lens <NUM>. Moreover, the circular-shaped focusing structure <NUM> is surrounding the central clear zone <NUM> having a circular central clear zone width cw810 of <NUM>. The width w801 of the circular-shaped focusing structure <NUM> is <NUM>. The neighboring circular-shaped structure <NUM> is arranged concentrically to the inner circular-shaped structure <NUM>, encircling the circular central clear zone <NUM>, with a pitch p801 of <NUM>. The ratio of the width w801 and the pitch p801 results in a length-based fill factor If801 of <NUM>% and a surface-based fill factor of <NUM>%.

Table <NUM> below shows different design characteristics of the inventive spectacle lens, in the order of satisfaction of wearability of the wearer. The subjects of a study evaluated said design characteristics in a range from <NUM> to <NUM>, wherein <NUM> equals to best possible wearability of a spectacle lens (e.g., a single vision spectacle lens with a length-based fill factor of <NUM>%) and <NUM> equals to the worst possible wearability of a spectacle lens (e.g., a single vision spectacle lens with a length-based fill factor of <NUM>%). A satisfaction of wearability greater or equal to <NUM> is considered as sufficient, hence the children would probably accept such lenses with said satisfaction of wearability and would probably not to tend to dismiss the spectacle lens.

The lenses <NUM> to <NUM> in Table <NUM> are therefore further embodiments of the inventive spectacle lens and the lenses <NUM> to <NUM> are considered as reference lenses for the lenses <NUM> to <NUM> in reference to the satisfaction of wearability.

Claim 1:
Spectacle lens (<NUM> to <NUM>) comprising
a central clear zone (<NUM>, <NUM>, <NUM>, ...) having a central clear zone width (cw110, cw210, cw310, ...), said central clear zone width (cw110, cw210, cw310, ...) being within a range of <NUM> to <NUM>, and
a plurality of ring-shaped focusing structures (<NUM>, <NUM>, <NUM>, ...) or a plurality of ring-shaped diffusing structures (<NUM>, <NUM>, <NUM>, ...) each having a respective width (w101, w102, w103, ...; w301, w302, w303, ...), said respective width (w101, w102, w103, ... ; w301, w302, w303, ...) being equal to or lower than <NUM>, each structure of said more ring-shaped focusing structures or said more ring-shaped diffusing structures surrounding a structure-free zone and there is a path within each structure which runs from a starting point within the structure around the structure-free zone and to the starting point again,
said spectacle lens being characterized in
having a surface-based fill factor (sf101, sf201) within at least one range of the following group of ranges:
- a range of <NUM> to <NUM>%,
- a range of <NUM> to <NUM>%,
said surface-based fill factor being defined as a surface area ratio of a surface area of an innermost of said more ring-shaped focusing structures (<NUM>, <NUM>, <NUM>, ...) and a sum of said surface area of said innermost one ring-shaped focusing structure (<NUM>, <NUM>, <NUM>, ...) and an area of a peripheral clear zone, said area of said peripheral clear zone being enclosed by an outer onset line of said innermost ring-shaped focusing structure and an inner onset line of a neighbouring ring-shaped focusing structure, or said surface-based fill factor being as a surface area ratio of a surface area of an innermost of said more ring-shaped diffusing structures (<NUM>, <NUM>, <NUM>, ...) and a sum of said surface area of said innermost one ring-shaped diffusing structure (<NUM>, <NUM>, <NUM>, ...) and an area of a peripheral clear zone, said area of said peripheral clear zone being enclosed by an outer onset line of said innermost ring-shaped diffusing structure and an inner onset line of a neighbouring ring-shaped diffusing structure.