# US 2021/0278701 A1 · Method for determining an ophthalmic lens > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0278701 A1 - Document ID: US20210278701A1 - Status: Published application - Kind: A1 - Application number: 17/261,747 - Filed: 2019-08-27 - Published: 2021-09-09 - Earliest claimed: 2018-08-28 - Assignees: Essilor International - Applicants: Essilor |nternationa| - Inventors: Mélanie HESLOUIS; Olivier ROUSSEL; Laurent CALIXTE - Web page: https://patentgrep.com/patent/US20210278701A1 ## CPC - G02C 7/061: {Spectacle lenses with progressively varying focal power} - G02C 7/025: {considering parameters of the viewed object} - G02C 7/028: {Special mathematical design techniques} - 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 A method for determining an ophthalmic lens adapted to a wearer, the method including: receiving wearer data including at least the ophthalmic prescription of the wearer; receiving a set of object points associated with target optical performances based on the wearer data; determining an ophthalmic lens adapted to the wearer, the ophthalmic lens providing optical performances, for light rays propagating from the set of object points to the center of rotation of the eye of the wearer passing through the ophthalmic lens, the closest to the target optical performances. ## Claims ### Claim 1 A method implemented by computer means for determining an ophthalmic lens adapted to a wearer, the method comprising: receiving wearer data comprising at least the ophthalmic prescription of said wearer; receiving a set of object points associated with target optical performances based on the wearer data; determining an ophthalmic lens adapted to the wearer, said ophthalmic lens providing optical performances, for light rays propagating from the set of object points to the center of rotation of the eye of the wearer passing through the ophthalmic lens, the closest to the target optical performances. ### Claim 2 (depends on 1) The method according to claim 1, the set of object points is determined by: determining a set of object points based on the wearer data, associating target optical performances to the set of object points based on the wearer data. ### Claim 3 (depends on 2) The method according to claim 2, wherein the set of object points and the associated target optical performances are determined using a reference ophthalmic lens based on the prescription of the wearer data placed in reference wearing conditions in front of the center of rotation of a reference eye. ### Claim 4 (depends on 3) The method according to claim 3, wherein the reference ophthalmic lens corresponds to an ophthalmic lens based on the ophthalmic prescription of the right eye of the wearer or the left eye of the wearer or based on the weighted average ophthalmic prescription between both eyes of the wearer. ### Claim 5 (depends on 1) The method according to claim 1, wherein determining an ophthalmic lens adapted to the wearer comprises, at least, selecting among a list of different ophthalmic lenses the ophthalmic lens that provides optical performances for light rays propagating from a selection of at least part of object points of said set of object points to the center of rotation of the eye of the wearer passing through the ophthalmic lens the closest to the target optical performances. ### Claim 6 (depends on 1) The method according to claim 1, wherein determining an ophthalmic lens adapted to the wearer comprises optimizing an initial ophthalmic lens so that the light rays propagating from a selection of at least part of object points of said set of object points to the center of rotation of the eye of the wearer passing through the ophthalmic lens fulfill at best the target optical performances. ### Claim 7 (depends on 1) The method according to claim 1, wherein when associating target optical performances to a selection of points of the set of object points, at least one object point at a first distance from the center of rotation of the eye has the optical power and/or the astigmatism and/or the astigmatism axis that corresponds to said first distance vision prescription of the wearer. ### Claim 8 (depends on 1) The method according to claim 1, wherein the ophthalmic lens is a power variation ophthalmic lens having at least two points of reference corresponding to ophthalmic prescriptions for two different viewing distances. ### Claim 9 (depends on 8) The method according to claim 8, wherein when associating target optical performances to a selection of points of the set of object points, at least one object point at a second distance different from the first distance has the optical power and/or the astigmatism and/or the astigmatism axis that corresponds to said second distance vision prescription of the wearer. ### Claim 10 (depends on 1) The method according to claim 1, wherein the method further comprises prior to associating target optical performances, a step of projecting a selection of at least part of object points that correspond to the meridian of the reference ophthalmic lens on a plane. ### Claim 11 (depends on 1) The method according to claim 1, applying, wherein the method further comprises prior to associating target optical performances, a step of extruding a selection of a least part of said set of object points either along a direction or about an axis passing through a point along the segment linking both center of rotation of the eyes of the wearer. ### Claim 12 (depends on 1) A method implemented by computer means for determining a pair of ophthalmic lenses adapted to a wearer, the method comprising implementing the method according to claim 1 to both ophthalmic lenses using a common selection of binocular object points corresponding to at least part of the set of object points associated with target optical performances based on the wearer data. ### Claim 13 (depends on 12) The method according to claim 12, wherein the common selection of binocular object points corresponds to a weighted sum of the projection of a selection of at least part of object points that correspond to the meridian of each reference ophthalmic lens on a common plane. ### Claim 14 (depends on 13) The method according to claim 13, wherein the weighted sum is done for a plurality of gazing direction from the cyclopean eye of the wearer. ### Claim 15 A pair of progressive ophthalmic lenses adapted for a wearer in worn conditions, wherein for a given set of object points corresponding to gaze directions within an angular disc of 35° of diameter centered on a direction of gaze corresponding to an angle of declination of 8° and 0° of azimuth angle and with a sampling step of 2°, 1 ∑ object ⁢ ⁢ points ⁢ ∑ object ⁢ ⁢ points ⁢ ⁢  A r - A l  Add is smaller than or equal to 0.026 with Ar the resulting astigmatism at the given object point through the right progressive ophthalmic lens, Al the resulting astigmatism at the given object point through the left progressive ophthalmic lens and Add the prescribed addition of the wearer.