# US 8,540,365 B2 · Ophthalmic lens element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,365 B2 - Document ID: US8540365B2 - Status: Granted - Kind: B2 - Application number: 12/739,577 - Filed: 2008-10-23 - Published: 2011-02-17 - Granted: 2013-09-24 - Earliest claimed: 2007-10-23 - Assignees: Vision CRC Limited - Applicants: Saulius Raymond Varnas - Inventors: Saulius Raymond Varnas - Web page: https://patentgrep.com/patent/US8540365B2 ## CPC - G02C 7/02: Lenses; Lens systems {; Methods of designing lenses} - G02C 7/063: {Shape of the progressive surface} - G02C 2202/24: Myopia progression prevention - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) ## Abstract An ophthalmic lens element is disclosed. The lens element includes a front surface and a rear surface, at least one which includes a horizontal meridian and a vertical meridian. A central region of the lens element includes a foveal vision zone providing a first power for providing clear foveal vision for a wearer. A peripheral region of positive power relative to the first power is also included. The peripheral region includes dual progressive zones located bilaterally of the vertical meridian and extending radially outwardly from the central region. The lens element provides a distribution of surface astigmatism which provides, on the horizontal meridian, a relatively low surface astigmatism in the central region and the progressive zones. ## Claims ### Claim 1 An ophthalmic lens element including a front surface and a rear surface, at least one of the surfaces including a horizontal meridian and a vertical meridian, the lens element including: a central region including a foveal vision zone providing a first power for providing clear foveal vision for a wearer; and a peripheral region of positive power relative to the first power, the peripheral region including dual progressive zones located bilaterally of the vertical meridian and extending radially outwardly from the central region; wherein the lens element provides a distribution of surface astigmatism which provides, on the horizontal meridian, a relatively low surface astigmatism in the central region and the progressive zones. ### Claim 2 (depends on 1) An ophthalmic lens element according to claim 1 wherein each progressive zone provides a mean power profile along a respective horizontal semi-meridian that provides a positive power gradient over a range defined by ra≦rx≦rb in which ra and rb are radial distances along each horizontal semi-meridian from the optical centre of the lens. ### Claim 3 (depends on 1) An ophthalmic lens element according to claim 1 wherein the first power is a prescribed power for providing an optical correction corresponding to a wearer's on-axis distance vision viewing requirements. ### Claim 4 (depends on 1) An ophthalmic lens element according to claim 1 wherein the positive power in the progressive zones provides an optical correction for retarding or arresting myopia associated with a peripheral region of the retina along the horizontal meridian of the wearer's eye. ### Claim 5 (depends on 2) An ophthalmic lens element according to a claim 2 wherein the range defined by ra≦rx≦rb is substantially 10 mm≦rx≦22 mm. ### Claim 6 (depends on 2) An ophthalmic lens element according to claim 2 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 1.00 D relative to the refracting power at the optical centre of the lens element. ### Claim 7 (depends on 2) An ophthalmic lens element according to claim 2 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 1.50 D relative to the refracting power at the optical centre of the lens element. ### Claim 8 (depends on 2) An ophthalmic lens element according to claim 2 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 2.00 D relative to the refracting power at the optical centre of the lens element. ### Claim 9 (depends on 2) An ophthalmic lens element according to claim 2 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 2.50 D relative to the refracting power at the optical centre of the lens element. ### Claim 10 (depends on 2) An ophthalmic lens element according to claim 2 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 3.00 D relative to the refracting power at the optical centre of the lens element. ### Claim 11 (depends on 2) An ophthalmic lens element according to claim 2 wherein ra corresponds with a boundary between the foveal vision zone and the progressive zones defined by a +0.25 D contour of mean surface power on the mean power profile. ### Claim 12 (depends on 2) An ophthalmic lens element according to claim 2 wherein the difference between ra and rb is not less than substantially 8 mm. ### Claim 13 (depends on 2) An ophthalmic lens element according to claim 2 wherein the first power is in the range from plano to −4.00 D. ### Claim 14 (depends on 1) An ophthalmic element according to claim 1 wherein the foveal vision zone includes an aperture having a shape and/or size that corresponds with the extent of a wearer's typical eye rotations before they engage head rotation. ### Claim 15 (depends on 1) A series of ophthalmic lens elements according to claim 1 wherein each lens in the series provides a peripheral region having a range of positive mean power corresponding with different peripheral correction requirements. ### Claim 16 (depends on 15) A series of ophthalmic lens elements according to claim 15 wherein for each lens in the series the size and/or shape of the central region is associated with a predetermined range of eye rotations for the wearer. ### Claim 17 An ophthalmic lens element including a lens surface having: a horizontal meridian and a vertical meridian; a central region including a foveal vision zone providing a surface power to achieve a refracting power for providing clear foveal vision for a wearer; and a peripheral region of positive surface mean power relative to the surface power of the central region, the peripheral region including dual progressive zones located bilaterally of the vertical meridian and extending radially outwardly along the horizontal meridian from the central region, each progressive zone providing a gradual increase in surface mean power from the surface power of the central region; wherein the lens surface provides a distribution of surface astigmatism which provides, along the horizontal meridian, a relatively low surface astigmatism in the central region and the progressive zones. ### Claim 18 (depends on 17) An ophthalmic lens element according to claim 17 wherein each progressive zone provides a mean surface power profile along a respective horizontal semi-meridian that provides a positive surface power gradient over a range defined by ra≦rx≦rb in which ra and rb are radial distances along each horizontal semi-meridian from the optical centre of the lens. ### Claim 19 (depends on 17) An ophthalmic lens element according to claim 17 wherein the refracting power is a prescribed power for providing an optical correction corresponding to a wearer's on-axis distance vision viewing requirements. ### Claim 20 (depends on 17) An ophthalmic lens element according to claim 17 wherein the positive surface power in the progressive zones provides an optical correction for retarding or arresting myopia associated with a peripheral region of the retina along the horizontal meridian of the wearer's eye. ### Claim 21 (depends on 18) An ophthalmic lens element according to claim 18 wherein the range defined by ra≦rx≦rb is substantially 10 mm≦rx≦22 mm. ### Claim 22 (depends on 18) An ophthalmic lens element according to claim 18 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean surface power increase of at least 1.00 D relative to the surface power at the optical centre. ### Claim 23 (depends on 18) An ophthalmic lens element according to claim 18 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean surface power increase of at least 1.50 D relative to the surface power at the optical centre. ### Claim 24 (depends on 18) An ophthalmic lens element according to claim 18 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 2.00 D relative to the surface power at the optical centre. ### Claim 25 (depends on 18) An ophthalmic lens element according to claim 18 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 2.50 D relative to the surface power at the optical centre. ### Claim 26 (depends on 18) An ophthalmic lens element according to claim 18 wherein the positive gradient over the range ra≦rx≦rb provides a positive mean power increase of at least 3.00 D relative to the refracting power at the optical centre. ### Claim 27 (depends on 18) An ophthalmic lens element according to claim 18 wherein ra corresponds with a boundary between the foveal vision zone and the progressive zones defined by a +0.25 D contour of mean surface power on the mean power profile. ### Claim 28 (depends on 18) An ophthalmic lens element according to claim 18 wherein the difference between ra and rb is not less than substantially 8 mm. ### Claim 29 (depends on 17) An ophthalmic lens element according to claim 17 wherein the foveal vision zone includes an aperture having a shape and/or size that corresponds with the extent of a wearer's typical eye rotations before they engage head rotation. ### Claim 30 (depends on 17) A series of ophthalmic lens elements according to claim 17 wherein each lens in the series provides a peripheral region having a range of positive mean power corresponding with different peripheral correction requirements. ### Claim 31 (depends on 30) A series of ophthalmic lens elements according to claim 30 wherein for each lens in the series the size and/or shape of the central region is associated with a predetermined range of eye rotations for the wearer. ### Claim 32 A method of dispensing or designing an ophthalmic lens element for retarding or arresting myopia in a wearer's eye, the method including: obtaining, for the wearer: a first required value of optical correction for foveal vision for on-axis viewing tasks; and a second required value of optical correction for providing a stimulus for retarding or arresting myopia in a peripheral region of the wearer's eye located along the horizontal meridian of the eye; selecting or designing an ophthalmic lens element according to the values of optical correction, the ophthalmic lens element having a front surface and a rear surface, at least one of the surfaces including a horizontal meridian and a vertical meridian, the lens element including: a central region including a foveal vision zone providing a first power corresponding to the first required value; and a peripheral region of positive power relative to the first power, the peripheral region including dual progressive zones located bilaterally of the vertical meridian and extending radially outwardly from the central region, the progressive zones providing a value or distribution of plus power according to the second required value; wherein the lens element provides a distribution of surface astigmatism which provides, on the horizontal meridian, a relatively low surface astigmatism in the central region and the progressive zones. ### Claim 33 A semi-finished ophthalmic lens blank including a first surface having: a horizontal meridian and a vertical meridian; a central region including a foveal vision zone providing a surface power to achieve a refracting power for providing clear foveal vision for a wearer; and a first progressive zone located nasally of the central region and a second progressive zone located temporally of the central region, each progressive zone extending radially outwardly from the central region to provide a gradual increase in surface mean power along the horizontal meridian; wherein the surface provides a distribution of surface astigmatism which provides, along the horizontal meridian, a relatively low surface astigmatism in the central region and the progressive zones. ### Claim 34 (depends on 33) A finished lens element for a wearer, the finished lens element formed from the semi-finished ophthalmic lens of claim 33, the finished lens element providing a second surface which optically combines with the first surface so that when worn by the wearer the finished lens element positions the tangential focal plane and the sagittal focal plane on or in front of the wearer's retina along the horizontal meridian of the eye. ### Claim 35 (depends on 34) A finished lens element according to claim 34 wherein the tangential focal plane leads the sagittal focal plane. ### Claim 36 (depends on 34) A finished lens element according to claim 34 wherein the sagittal focal plane leads the tangential focal plane.