Patent Application
20240393615
The present disclosure relates to a spectacle lens for the reduction of progression of myopia.
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 −6 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 Myo Vision), an efficiency of 30% for reducing axial length growth could be demonstrated in defined test subject groups (Sankaridurg, P., Donovan, L., Varnas, S., Ho, A., Chen, X., Martinez, A., Fisher, S., Lin, Z., Smith, E. L., 3rd, Ge, J., & Holden, B. “Spectacle lenses designed to reduce progression of myopia: 12-month results,” Optom Vis Sci, 87 (9), 631-641). Using other optical intervention methods with spectacle lenses, far higher effectiveness of up to 70% (see, e.g., Bao J, Yang A, Huang Y, Li X, Pan Y, Ding C, Lim E W, Zheng J, Spiegel D P, Drobe B, Lu F, Chen H. “One-year myopia control efficacy of spectacle lenses with aspherical lenslets,” Br J Ophthalmol. 2021:318367), 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
EP 3561578 A1 discloses in
WO 2019166659 A1 shows in
Neither EP 3561578 A1 nor WO 2019166659 A1 disclose concrete dimensions for the 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 EP 3561578 A1 and WO 2019166659 A1, respectively, complain of discomfort.
In addition to the variant of spectacle lenses with concentric rings shown in
WO2021069443 A1 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 a slow down, retardation, or prevention of a progress of the abnormal refraction of the eye of the person is achieved.
CN10963925 A 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.
U.S. Pat. No. 20,110,51079 A1 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.
EP3888894 A1 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 1.1 millimeter in diameter, and about 1 micron in height. Refractive power is at the center of the lens, while the micro lenses form an array as the specific pattern.
WO2021069443 A1, on which the present disclosure is based, discloses in
EP3888894 A1 discloses in
Some wearers of spectacle lenses with large lenslet diameter report of optical discomfort.
It is an object of the present disclosure to present a spectacle lens providing a good balance between the wearability of the spectacle lens and the reduction of progression of myopia. Moreover, the manufacturability of the inventive spectacle lens comprising ring-shaped focusing structure should be ensured.
The problem is solved by a spectacle lens as disclosed herein. Advantageous exemplary embodiments and developments are discussed in detail below.
The spectacle lens according to the disclosure comprises one or more ring-shaped focusing structures or one or more ring-shaped diffusing structures each having a respective width, and at least one additional feature of the following group of features:
A spectacle lens in the context of the present disclosure is an ophthalmic lens worn in front of, but not in contact with, the eyeball (DIN ISO 13666:2019, section 3.5.2), 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 13666:2019, section 3.5.1).
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 typically 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
A structure providing a ring-shaped focal line is shown, e.g., in
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 shown, e.g., in FIG. 1 of CN 213659117 U, 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 WO 2019166659 A1, page 17, line 25 to page 19, line 8 with reference to
In the context of the present disclosure, 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 disclosed, e.g., in WO 2010/075319 A2, WO 2018/026697 A1, WO 2019/152438 A1, and WO 2020/014613 A1, 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
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 to 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 13666:2019, section 3.2.15) 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 13666:2019, Sec. 3.15.3) and far portion (DIN ISO 13666:2019, section 3.15.1).
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 6 mm to 9.4 mm has the advantage that a small clear zone, e.g., 6 mm increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. At the same time the 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., 9.4 mm decreases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. At the same time the 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”):
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 60% 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 40% 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 40% to 60%. In particular, a length-based fill factor of 50% is typical.
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 the surface area of the innermost one or more ring-shaped focusing structure or the 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 the innermost one or more ring-shaped focusing structure or the 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, the 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, the 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, the 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, the 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, the 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 59.2% 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 56.1% 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 surface-based fill factor in the range of 34.6 to 59.2%. In particular, a surface-based fill factor of 46.4 to 47.7% is typical.
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.
Exemplary embodiments of a spectacle lens designed according to the inventive concept may be characterized in that the width(s) of the ring-shaped focusing structures or the 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 exemplary embodiment of the disclosure 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 6 mm to 7 mm has the advantage that a small clear zone, e.g., 6 mm increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. At the same time the 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 7 mm to 9.4 mm has the advantage that a large clear zone, e.g., 9.4 mm increases the acceptance of the spectacle lens by the wearer due to the increased comfort of wearability of the spectacle lens.
Another advantageous exemplary embodiment of a spectacle lens according to the present disclosure is characterized in that the one or more ring-shaped focusing structures provide an additional power as compared to the 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 13666:2019, section 3.10.2) and which is usually considered in the prescription by the “cylinder” value or, abbreviated, “cyl”.
The advantage of this further advantageous exemplary embodiment is to define the balance between the wearability and the manufacturing of the inventive spectacle lens. An additional power between 10 and 12 diopter increases the probable efficacy of the spectacle lens for the reduction of progression of myopia for the wearer. An additional power between 6 and 8 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 6 diopter to 8 diopter. In particular an additional power of 10 diopter is typical.
The spectacle lens according to the present disclosure may be in the form of computer-readable instructions for the production thereof stored on a computer-readable data carrier.
The spectacle lens being designed according to the inventive principle may also be realized in the form of computer-readable data stored on a computer-readable data carrier.
The spectacle lens according to the present disclosure may be in the form of computer-readable instructions for the production thereof transformed into a data carrier signal.
The spectacle lens being designed according to the inventive principle may also be realized in the form of a data carrier signal.
The spectacle lens according to the present disclosure may be in the form of a numerical data set.
The spectacle lens according to the present disclosure may be in the form of a data signal transferring a numerical data set.
The spectacle lens according to the present disclosure may be in the form of a data carrier storing a numerical data set.
The disclosure will be described exemplarily in the following with reference to the drawings.
A first exemplary embodiment of the present disclosure is described with respect to
The circular-shaped focusing structures 101 to 105 are formed such that an additional focal power of 12 diopters is provided as compared to the focal power of the central clear zone 110. This additional focal power is recognized by the wearer as blur and is demonstrated, e.g., in Li X, Ding C, Li Y, Lim E W, 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 2021. This additional focal power leads to a reduction of progression of myopia of the wearer.
The single vision spectacle lens 100 shown in
The determination of an inner onset and an outer onset of a circular-shaped focusing structure is explained exemplarily for the circular-shaped focusing structure 101. The inner onset io101 of the circular-shaped focusing structure 101 is a point directly adjacent to the central clear zone 110. The outer onset 00101 of the circular-shaped focusing structure 101 is a point radially arranged to the inner onset io101 and directly adjacent to the peripheral clear zone 120.
The width w101 of the circular-shaped focusing structure 101 is the radial distance between the inner onset io101 and the outer onset 00101. The width w102 and w103 are determined accordingly with the inner onsets io102, io103 and the outer onsets 00102, 00103.
The pitch p101 of the circular-shaped focusing structure 101 is the radial distance between the inner onset io101 of the circular-shaped focusing structure 101 and the inner onset io102 of the circular-shaped focusing structure 102. 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 100 is the diameter of the central clear zone 110.
The single vision lens 100 according to the first exemplary embodiment of
A second exemplary embodiment of the present disclosure is described with respect to
The coated circular-shaped focusing structures 201 to 205 are formed such that an additional focal power of 12 diopters is provided as compared to the focal power of the coated central clear zone 210. This additional focal power is recognized by the wearer as blur and is demonstrated, e.g., in Li X, Ding C, Li Y, Lim E W, 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 2021. This additional focal power leads to a reduction of progression of myopia of the wearer.
The coated single vision spectacle lens 200 shown in
The determination of an inner onset and an outer onset of a coated circular-shaped focusing structure is explained exemplarily for the coated circular-shaped focusing structure 201. The inner onset io201 of the coated circular-shaped focusing structure 201 represents the first measurable inner position (measured from the optical center of the spectacle lens) of the coated ring-shaped focusing structure 201 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
The outer onset 00201 of the coated circular-shaped focusing structure 201 represents the first measurable outer position (measured from the optical center of the spectacle lens) of the coated ring-shaped focusing structure 201 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
The width w201 of the coated circular-shaped focusing structure 201 is the radial distance between the inner onset io201 and the outer onset 00201. The width w202 and w203 are determined accordingly with the inner onsets io202, io203 and the outer onsets 00202, 00203.
The pitch p201 of the coated circular-shaped focusing structure 201 is the radial distance between the inner onset io201 of the coated circular-shaped focusing structure 201 and the inner onset io202 of the coated circular-shaped focusing structure 202. 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 200 is the diameter of the coated central clear zone 210.
The coated single vision lens 200 according to the second exemplary embodiment of
A third exemplary embodiment of the present disclosure is described with respect to
The circular-shaped diffusing structures 301 to 305 are formed such that the visual acuity of the wearer is reduced by 0.1 to 0.2 log MAR. Hence, the circular-shaped diffusing structures 301 to 305 lead to a diffusion and/or scattering of light.
The single vision spectacle lens 300 shown in
The determination of an inner onset and an outer onset of a circular-shaped diffusing structure is explained exemplarily for the circular-shaped diffusing structure 301. The inner onset io301 of the circular-shaped diffusing structure 301 is a point directly adjacent to the central clear zone 310. The outer onset 00301 of the circular-shaped diffusing structure 301 is a point radially arranged to the inner onset io301 and directly adjacent to the peripheral clear zone 320.
The width w301 of the circular-shaped diffusing structure 301 is the radial distance between the inner onset io301 and the outer onset 00301. The width w302 and w303 are determined accordingly with the inner onsets io302, io303 and the outer onsets 00302, 00303.
The pitch p301 of the circular-shaped diffusing structure 301 is the radial distance between the inner onset io301 of the circular-shaped diffusing structure 301 and the inner onset io302 of the circular-shaped diffusing structure 302. 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 300 is the diameter of the central clear zone 310.
The single vision lens 300 according to the third exemplary embodiment of
A fourth exemplary embodiment of the present disclosure is described with respect to
The circular-shaped focusing structures 401 to 405 are formed such that an additional focal power of 8 diopters is provided as compared to the focal power of the central clear zone 410. This additional focal power is recognized by the wearer as blur and is demonstrated, e.g., in Li X, Ding C, Li Y, Lim E W, 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 2021. This additional focal power leads to a reduction of progression of myopia of the wearer.
The single vision spectacle lens 400 shown in
The single vision lens 400 according to the fourth exemplary embodiment of
A fifth exemplary embodiment of the present disclosure is described with respect to
The circular-shaped focusing structures 501 to 505 are formed such that an additional focal power of 10 diopters is provided as compared to the focal power of the central clear zone 510. This additional focal power is recognized by the wearer as blur and is demonstrated, e.g., in Li X, Ding C, Li Y, Lim E W, 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 2021. This additional focal power leads to a reduction of progression of myopia of the wearer.
The single vision spectacle lens 500 shown in
The single vision lens 500 according to the fourth exemplary embodiment of
A sixth exemplary embodiment of the present disclosure is described with respect to
The circular-shaped focusing structures 601 to 605 are formed such that an additional focal power of 12 diopters is provided as compared to the focal power of the central clear zone 610. This additional focal power is recognized by the wearer as blur and is demonstrated, e.g., in Li X, Ding C, Li Y, Lim E W, 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 2021. This additional focal power leads to a reduction of progression of myopia of the wearer.
The single vision spectacle lens 600 shown in
The single vision lens 600 according to the fourth exemplary embodiment of
Another exemplary embodiment of the present disclosure is described with respect to
The distance portion 750 comprises four circular-shaped focusing structures 701 to 704. The structures are concentrically arranged towards the distance reference point 751. The distance reference point 751 is the point on the front surface of the spectacle lens at which the verification power 753 for the distance portion 750 applies (DIN ISO 13666:2019, section 3.2.20). The verification power 753 is the dioptric power of the lens, specifically calculated and provided by the manufacturer as the reference for verification (DIN ISO 13666:2019, section 3.10.15). Moreover, the circular-shaped structure 701 is surrounding the central clear zone 710 which comprises a central clear zone width cw710 of 7.0 mm. The width w701 of the circular-shaped structure 701 corresponds to 0.5 mm. The neighboring circular-shaped structure 702 is arranged concentrically to the circular-shaped structure 701 with a pitch p701 of 1.5 mm. The pitch p701 is the distance from the inner onset of circular-shaped structure 701 to the inner onset of the circular-shaped structure 702. The ratio of the width w701 and the pitch p701 results in a length-based fill factor lf701 of 33.3% and a surface-based fill factor of 29.4%.
The near portion 770 comprises two circular-shaped focusing structures 711 and 712. The structures are concentrically arranged towards the near reference point 771. The near reference point 771 is the point on the front surface of the spectacle lens at which the verification power 753 for the near portion 770 applies (DIN ISO 13666:2019, section 3.2.21). The verification power 753 is the dioptric power of the lens, specifically calculated and provided by the manufacturer as the reference for verification (DIN ISO 13666:2019, section 3.10.15). Moreover, the circular-shaped structure 701 is surrounding the central clear zone 720 which comprises a central clear zone width cw711 of 6.0 mm. The width w711 of the circular-shaped structure 711 corresponds to 0.5 mm. The neighboring circular-shaped structure 712 is arranged concentrically to the circular-shaped structure 711 with a pitch p711 of 1.1 mm. The pitch p711, is the distance from the inner onset of circular-shaped structure 711 to the inner onset of the circular-shaped structure 712. The ratio of the width w711 and the pitch p711 results in a length-based fill factor lf711 of 45.5% and a surface-based fill factor of 41.6%.
Another exemplary embodiment of the present disclosure is described with respect to
The circular-shaped focusing structures 801 to 805 are formed such that an additional focal power of 12 diopters is provided as compared to the focal power of the central clear zone 810. This additional focal power is recognized by the wearer as blur and is demonstrated, e.g., in Li X, Ding C, Li Y, Lim E W, 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 2021. This additional focal power leads to a reduction of progression of myopia of the wearer.
The single vision spectacle lens 800 shown in
Table 1 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 the design characteristics in a range from 1 to 10, wherein 10 equals to best possible wearability of a spectacle lens (e.g., a single vision spectacle lens with a length-based fill factor of 0%) and 1 equals to the worst possible wearability of a spectacle lens (e.g., a single vision spectacle lens with a length-based fill factor of 100%). A satisfaction of wearability greater or equal to 4.0 is considered as sufficient, hence the children would probably accept such lenses with the satisfaction of wearability and would probably not end to dismiss the spectacle lens.
The lenses 1 to 9 in Table 1 are therefore further exemplary embodiments of the inventive spectacle lens and the lenses 10 to 16 are considered as reference lenses for the lenses 1 to 9 in reference to the satisfaction of wearability.
The foregoing description of the exemplary embodiments of the disclosure illustrates and describes the present invention. Additionally, the disclosure shows and describes only the exemplary embodiments but, as mentioned above, it is to be understood that the disclosure is capable of use in various other combinations, modifications, and environments and is capable of changes or modifications within the scope of the concept as expressed herein, commensurate with the above teachings and/or the skill or knowledge of the relevant art.
The term “comprising” (and its grammatical variations) as used herein is used in the inclusive sense of “having” or “including” and not in the exclusive sense of “consisting only of.” The terms “a” and “the” as used herein are understood to encompass the plural as well as the singular.
All publications, patents and patent applications cited in this specification are herein incorporated by reference, and for any and all purposes, as if each individual publication, patent or patent application were specifically and individually indicated to be incorporated by reference. In the case of inconsistencies, the present disclosure will prevail.
| Number | Date | Country | Kind |
|---|---|---|---|
| PCT/EP2022/053854 | Feb 2022 | WO | international |
This application is a continuation application of international patent application PCT/EP2022/087631, filed on Dec. 22, 2022 and designating the U.S., which claims priority to international patent application PCT/EP2022/053854, filed on Feb. 16, 2022, both of which are hereby incorporated by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2022/087631 | Dec 2022 | WO |
| Child | 18793829 | US |
