# US 2022/0035183 A1 · Method and device for measuring the local refractive power and/or refractive power distribution of a spectacle lens > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0035183 A1 - Document ID: US20220035183A1 - Status: Published application - Kind: A1 - Application number: 17/504,905 - Filed: 2021-10-19 - Published: 2022-02-03 - Earliest claimed: 2019-04-23 - Assignees: Carl Zeiss Vision International GmbH - Applicants: Carl Zeiss Vision International GmbH - Inventors: Carsten Glasenapp - Web page: https://patentgrep.com/patent/US20220035183A1 ## CPC - G02C 13/005: {Measuring geometric parameters required to locate ophtalmic lenses in spectacles frames (apparatus for testing or instruments for examining the eyes per se A61B3/00; machines or devices and accessories for grinding the edges of lenses using spectacles as a template B24B9/144)} - G01M 11/0228: {by measuring refractive power} - G06T 7/73: using feature-based methods - G02C 7/063: {Shape of the progressive surface} - 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) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract The local refractive power or the refractive power distribution of a spectacle lens is measured. A first image of a scene having a plurality of structure points and a left and/or a right spectacle lens of a frame front is captured with an image capturing device from a first capture position having an imaging beam path for structure points, which extends through the spectacle lens of the frame front. At least two further images of the scene are captured with the image capturing device from different capture positions, one of which can be identical with the first capture position, without the spectacle lenses of the spectacles or without the frame front containing the spectacle lenses having the structure points imaged in the first image, and the coordinates of the structure points in a coordinate system are calculated from the at least two further images of the scene by image analysis. ## Claims ### Claim 1 A method for measuring a local refractive power of a left and/or a right spectacle lens in a spectacle frame, the method comprising: capturing at least one first image representation of a scene with at least one structure point and with the left and/or the right spectacle lens in the spectacle frame with at least one image capture device from at least one first recording position having at least one imaging beam path for the at least one structure point, the imaging beam path passing through the left or the right spectacle lens; capturing at least two further image representations of the scene with the at least one structure point imaged in the at least one first image representation with the at least one image capture device, wherein the at least two further image representations are captured: without the left and/or the right spectacle lens of the spectacle frame from at least two different recording positions, one of which can be identical to the first recording position, or with the left and/or the right spectacle lens in the spectacle frame from at least two different further recording positions, which differ from the first recording position, wherein the respective imaging beam path for the at least one structure point captured in the at least one first image representation does not pass through the left and the right spectacle lens of the spectacle frame, wherein in the at least one first image representation of the scene a section of the spectacle frame of the pair of spectacles is captured, the section defining a coordinate system of the spectacle frame of the pair of spectacles; calculating coordinates of the at least one structure point in a coordinate system, which is referenced to the coordinate system of the spectacle frame, from the at least two further image representations of the scene by image evaluation; calculating an absolute position, a relative position, and a boundary of the spectacle frame with the image evaluation; and determining the local refractive power for at least one section of the left spectacle lens and/or for at least one section of the right spectacle lens with a ray model with imaging beam paths passing through the left and/or right spectacle lens, which reach the at least one structure point after refraction by the left and/or right spectacle lens, from the coordinates of the at least one structure point and a chief ray, which passes through the left or right spectacle lens and which is calculated for the image of the at least one structure point in the at least one first image representation of the scene corresponding to the respective position of the at least one image capture device. ### Claim 2 A method for measuring a local refractive power of a left and/or a right spectacle lens in a spectacle frame, the method comprising: capturing at least two first image representation of a scene with at least one structure point and with the left and/or the right spectacle lens in the spectacle frame with at least one image capture device from at least two recording positions respectively having at least one imaging beam path for the at least one structure point, the respective imaging beam paths passing through the left or the right spectacle lens; capturing at least two further image representations of the scene with the at least one structure point imaged in the at least two first image representations with the at least one image capture device from at least two different recording positions without the spectacle frame containing the left and/or the right spectacle lens, wherein in the at least two first image representations of the scene a section of the spectacle frame of the pair of spectacles is captured, the section defining a coordinate system of the spectacle frame of the pair of spectacles; calculating coordinates of the at least one structure point in a coordinate system, which is referenced to the coordinate system of the spectacle frame, from the at least two further image representations of the scene with image evaluation; calculating an absolute position, a relative position, and a boundary of the spectacle frame with the image evaluation; and determining the local refractive power for at least one section of the left spectacle lens and/or for at least one section of the right spectacle lens with a ray model with imaging beam paths passing through the left and/or right spectacle lens, which reach the at least one structure point after refraction by the left and/or right spectacle lens, from the coordinates of the at least one structure point and a chief ray, which passes through the left or right spectacle lens and which is calculated for the image of the at least one structure point in at least one of the first image representations of the scene corresponding to the respective position of the at least one image capture device. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein the image evaluation is implemented by an object recognition method. ### Claim 4 (depends on 1) The method as claimed in claim 1, further comprising capturing a multiplicity of first image representations of the scene and a multiplicity of further image representations of the scene, wherein the coordinates of the at least one structure point in the coordinate system which is referenced to the coordinate system of the spectacle frame are calculated from the multiplicity of further image representations of the scene. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein the scene contains a left eye and/or right eye of a spectacle wearer of the spectacle frame. ### Claim 6 (depends on 5) The method as claimed in claim 5, wherein the image capture device captures a multiplicity of image representations of the scene with a displacement of the image capture device, wherein the left eye and/or the right eye of the wearer of the spectacle frame gazes at the displaced image capture device, wherein respective viewing beam paths for different viewing directions of the left eye and/or right eye of the wearer of the spectacle frame through the left spectacle lens and/or the right spectacle lens of the spectacle frame are calculated from the multiplicity of image representations of the scene, and wherein the local refractive power of the left spectacle lens and/or the right spectacle lens is determined for each viewing direction therethrough. ### Claim 7 (depends on 1) The method as claimed in claim 1, wherein intrinsic parameters of the at least one image capture device are calculated with a Simultaneous Localization and Mapping (SLAM) algorithm. ### Claim 8 (depends on 7) The method as claimed in claim 7, wherein the intrinsic parameters are selected from the group of a focal length, an image center, shearing parameters, scaling parameters, and distortion parameters. ### Claim 9 (depends on 1) The method as claimed in claim 1, wherein a SLAM algorithm is used to calculate the coordinates of the at least one structure point and/or the recording positions of the at least one image capture device in the coordinate system, which is referenced to the coordinate system of the spectacle frame. ### Claim 10 (depends on 1) The method as claimed in claim 1, wherein the coordinates of at least some of the structure points in the scene are invariant. ### Claim 11 (depends on 1) The method as claimed in claim 1, wherein the coordinates of at least one structure point are calculated in a coordinate system, which is referenced to the coordinate system of the spectacle frame, by evaluating displacements between the image representations of the structure points in the scene from different recording positions. ### Claim 12 (depends on 1) The method as claimed in claim 1, wherein a displacement of the structure points in the coordinate system is recognized by evaluating proximity relations between the structure points in the scene, and wherein the coordinates of structure points displaced in the scene are not taken into account when determining the refractive power distribution for the at least one section of the right spectacle lens and/or the left spectacle lens. ### Claim 13 (depends on 1) A method for measuring a refractive power distribution of a left and/or a right spectacle lens in a spectacle frame, wherein the local refractive power of the left and/or right spectacle lens is measured according to the method as claimed in claim 1 at a plurality of different locations on the left and/or right spectacle lens. ### Claim 14 (depends on 1) A non-transitory computer program product comprising a computer program having program code for carrying out the method as claimed in claim 1 when the computer program is loaded on a computer unit and/or executed on the computer unit. ### Claim 15 (depends on 1) An apparatus for measuring the local refractive power of a left and/or a right spectacle lens in a spectacle frame, the apparatus comprising: an image capture device; and a computer unit, loaded onto which is a computer program with program code, the computer unit being configured to execute the method according to claim 1, wherein the computer unit is further configured to optionally measure the refractive power distribution of the left and/or the right spectacle lens in the spectacle frame by measuring the local refractive power at a plurality of different locations on the left and/or right spectacle lens. ### Claim 16 (depends on 15) The apparatus as claimed in claim 15, wherein the apparatus is configured as a smartphone, a tablet computer, or as a camera. ### Claim 17 (depends on 14) A portable non-transitory computer-readable data medium, on which the computer program as claimed in claim 14 is stored. ### Claim 18 A method for measuring a local refractive power of a left and/or a right spectacle lens in a spectacle frame, the method comprising: capturing at least one first image representation of a scene having a plurality of structure points and the left and/or the right spectacle lens in the spectacle frame with at least one image capture device from at least one first recording position having at least one imaging beam path for each of the plurality of structure points, the imaging beam path passing through the left and/or the right spectacle lens, capturing at least two further image representations of the scene without the left and/or the right spectacle lens of the spectacle frame or without the spectacle frame containing the left and/or the right spectacle lens but with the plurality of structure points imaged in the first image representation with the at least one image capture device from at least two different recording positions, one of which can be identical to the first recording position; calculating coordinates of the plurality of structure points in a coordinate system from the at least two further image representations of the scene by image evaluation; and determining the local refractive power for at least one section of the left spectacle lens and/or for at least one section of the right spectacle lens from the coordinates of the plurality of structure points and the image of the structure points in the at least one first image representation of the scene with an inverted approach, in which an optical interfaces and/or the refractive index of the left and/or right spectacle lens are calculated from the imaging beam paths for the structure points. ### Claim 19 A method for measuring a local refractive power of a left and/or a right spectacle lens in a spectacle frame, the method comprising: capturing at least one first image representation of a scene having a plurality of structure points and the left and/or the right spectacle lens in the spectacle frame with at least one image capture device from at least one first recording position having at least one imaging beam path for each of the plurality of structure points, the imaging beam path passing through the left and/or the right spectacle lens, capturing at least two further image representations of the scene with the left and/or the right spectacle lens with the at least one image capture device from at least two different further recording positions, which differ from the first recording position and which each have at least one imaging beam path for the structure points captured in the first image representation, the imaging beam paths not passing through the left and the right spectacle lens of the spectacle frame; calculating coordinates of the plurality of structure points in a coordinate system from the at least two further image representations of the scene by image evaluation; and determining the local refractive power for at least one section of the left spectacle lens and/or for at least one section of the right spectacle lens from the coordinates of the plurality of structure points and the image of the structure points in the at least one first image representation of the scene with an inverted approach, in which an optical interfaces and/or the refractive index of the left and/or right spectacle lens are calculated from the imaging beam paths for the structure points. ### Claim 20 (depends on 18) The method as claimed in claim 18, wherein the image evaluation is implemented by triangulation. ### Claim 21 (depends on 18) The method as claimed in claim 18, further comprising capturing a multiplicity of first image representations of the scene and a multiplicity of further image representations of the scene, wherein the coordinates of the at least one structure point in the coordinate system which is referenced to the coordinate system of the spectacle frame are calculated from the multiplicity of further image representations of the scene. ### Claim 22 (depends on 18) The method as claimed in claim 18, wherein the scene contains a left eye and/or right eye of a spectacle wearer of the spectacle frame. ### Claim 23 (depends on 22) The method as claimed in claim 22, wherein the image capture device captures a multiplicity of image representations of the scene with a displacement of the image capture device, wherein the left eye and/or the right eye of the wearer of the spectacle frame gazes at the displaced image capture device, wherein respective viewing beam paths for different viewing directions of the left eye and/or right eye of the wearer of the spectacle frame through the left spectacle lens and/or the right spectacle lens of the spectacle frame are calculated from the multiplicity of image representations of the scene, and wherein the local refractive power of the left spectacle lens and/or the right spectacle lens is determined for each viewing direction therethrough. ### Claim 24 (depends on 18) The method as claimed in claim 18, wherein intrinsic parameters of the at least one image capture device are calculated with a SLAM algorithm. ### Claim 25 (depends on 24) The method as claimed in claim 24, wherein the intrinsic parameters are selected from the group of a focal length, an image center, shearing parameters, scaling parameters, and distortion parameters. ### Claim 26 (depends on 18) The method as claimed in claim 18, wherein a SLAM algorithm is used to calculate the coordinates of the at least one structure point and/or the recording positions of the at least one image capture device in the coordinate system, which is referenced to the coordinate system of the spectacle frame. ### Claim 27 (depends on 18) The method as claimed in claim 18, wherein the coordinates of at least some of the structure points in the scene are invariant. ### Claim 28 (depends on 18) The method as claimed in claim 18, wherein the coordinates of at least one structure point are calculated in a coordinate system, which is referenced to the coordinate system of the spectacle frame, by evaluating displacements between the image representations of the structure points in the scene from different recording positions. ### Claim 29 (depends on 18) The method as claimed in claim 18, wherein a displacement of the structure points in the coordinate system is recognized by evaluating proximity relations between the structure points in the scene, and wherein the coordinates of structure points displaced in the scene are not taken into account when determining the refractive power distribution for the at least one section of the right spectacle lens and/or the left spectacle lens. ### Claim 30 (depends on 18) A method for measuring a refractive power distribution of a left and/or a right spectacle lens in a spectacle frame, wherein the local refractive power of the left and/or right spectacle lens is measured according to the method as claimed in claim 18 at a plurality of different locations on the left and/or right spectacle lens. ### Claim 31 (depends on 18) A non-transitory computer program product comprising a computer program having program code for carrying out the method as claimed in claim 18 when the computer program is loaded on a computer unit and/or executed on the computer unit. ### Claim 32 (depends on 18) An apparatus for measuring the local refractive power of a left and/or a right spectacle lens in a spectacle frame, the apparatus comprising: an image capture device; and a computer unit, loaded onto which is a computer program with program code, the computer unit being configured to execute the method according to claim 18, wherein the computer unit is further configured to optionally measure the refractive power distribution of the left and/or the right spectacle lens in the spectacle frame by measuring the local refractive power at a plurality of different locations on the left and/or right spectacle lens. ### Claim 33 (depends on 32) The apparatus as claimed in claim 32, wherein the apparatus is configured as a smartphone, a tablet computer, or as a camera. ### Claim 34 (depends on 31) A portable non-transitory computer-readable data medium, on which the computer program as claimed in claim 31 is stored.