# US 11,906,820 B2 · Spectacle lens and a method for producing 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 11,906,820 B2 - Document ID: US11906820B2 - Status: Granted - Kind: B2 - Application number: 18/191,053 - Filed: 2023-03-28 - Published: 2023-07-27 - Granted: 2024-02-20 - Earliest claimed: 2020-08-10 - Assignees: Carl Zeiss Vision International GmbH - Applicants: Carl Zeiss Vision International GmbH - Inventors: Katharina Rifai; Siegfried Wahl; Timo Kratzer - Web page: https://patentgrep.com/patent/US11906820B2 ## CPC - G02C 7/027: {considering wearer's parameters} - 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)} - G02C 7/021: {with pattern for identification or with cosmetic or therapeutic effects (methods and processes take preference, e.g. printing, marking or copying processes B41M; identification in general G09F3/00; producing decorative effects in general B44C; surface treatment of glass C03C15/00 - C03C23/00; positioning or marking of lenses B24B13/0055)} - G02C 13/003: {Measuring during assembly or fitting of spectacles} - G02C 2202/20: Diffractive and Fresnel lenses or lens portions - 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 spectacle lens for at least one eye of a user, a method for producing a spectacle lens, and a computer program product having executable instructions for performing the method for producing the spectacle lens are disclosed. The spectacle lens has a permanent marking which is or contains a diffractive structure, wherein a diffractive pattern generated by illumination of the diffractive structure is configured to be invisible upon a first kind of illumination and configured to be visible only upon a second kind of illumination. The permanent markings on the spectacle lens are, on one hand, invisible to the user or to a spectator looking at the user wearing the spectacle lens without utilizing specially selected optical aids but, on the other hand, enables continued control of the spectacle lens in front of the eye of the user by an optician or a specifically designated optical sensor. ## Claims ### Claim 1 A spectacle lens for at least one eye of a user, the spectacle lens comprising: a lens body having at least one permanent marking, wherein the at least one permanent marking is or contains at least one diffractive structure, wherein at least one diffractive pattern generated by illumination of the diffractive structure is configured to be invisible upon a first kind of illumination and configured to be visible only upon a second kind of illumination, wherein being visible is a property of the at least one diffractive pattern of being perceived by the at least one eye of the user, and wherein being invisible is a property of the at least one diffractive pattern of not being perceived by the at least one eye of the user, wherein the at least one diffractive pattern is configured to be visible only under illumination in at least one of a near-infrared spectral region and a near-ultraviolet spectral region, wherein the at least one permanent marking is configured to provide information about at least one of a location on the lens body, and wherein the information about the at least one location on the lens body is selected from at least one of: a distance reference point; at least one near reference point; a fitting cross; a prism reference point; and an alignment reference marking. ### Claim 2 (depends on 1) The spectacle lens according to claim 1, wherein the first kind of illumination of the spectacle lens is provided by a large-bandwidth light source, and wherein the large-bandwidth light source has a wavelength range above 150 nm. ### Claim 3 (depends on 2) The spectacle lens according to claim 2, wherein the large-bandwidth light source is selected from a natural light source or an artificial light source used for ordinary illumination purposes. ### Claim 4 (depends on 1) The spectacle lens according to claim 1, wherein the second kind of illumination of the spectacle lens is provided by a small-bandwidth light source, and wherein the small-bandwidth light source has a wavelength range of at maximum 150 nm. ### Claim 5 (depends on 4) The spectacle lens according to claim 4, wherein the small-bandwidth light source comprises a spectral band having a wavelength range of at maximum 150 nm. ### Claim 6 (depends on 4) The spectacle lens according to claim 4, wherein the small-bandwidth light source is configured to generate light in at least one of a near-infrared spectral region and a near-ultraviolet spectral region. ### Claim 7 (depends on 1) The spectacle lens according to claim 1, wherein the at least one diffractive pattern is configured to being visible only upon illumination an angle of the second kind of illumination with respect to a surface of the spectacle lens of at a maximum of 45° and/or upon being viewed through at least one further optical element. ### Claim 8 (depends on 1) The spectacle lens according to claim 1, wherein the at least one diffractive structure is configured to generate at least one holographic pattern upon illumination with the second kind of illumination of the spectacle lens. ### Claim 9 (depends on 1) The spectacle lens according to claim 1, wherein the at least one permanent marking is configured to provide information about an item of information related to the spectacle lens, or an item of information related to the at least one eye of the user. ### Claim 10 (depends on 1) The spectacle lens according to claim 1, wherein the at least one diffractive structure is a volume element comprised by the lens body which occupies at maximum 2% of a volume of the lens body. ### Claim 11 A method for producing a spectacle lens for at least one eye of a user, the method comprising: a) generating a spectacle lens based on instructions configured to compensate at least one ocular aberration of the at least one eye of the user; and b) introducing at least one permanent marking into a lens body of the spectacle lens, wherein the at least one permanent marking is introduced into the lens body such that the at least one permanent marking is or contains at least one diffractive structure, wherein at least one diffractive pattern generated by illumination of the diffractive structure is configured to be invisible upon a first kind of illumination and configured to be visible only upon a second kind of illumination, wherein being visible is a property of the at least one diffractive pattern of being perceived by the at least one eye of the user, and wherein being invisible is a property of the at least one diffractive pattern of not being perceived by the at least one eye of the user, wherein the at least one diffractive pattern is configured to be visible only under illumination in at least one of a near-infrared spectral region and a near-ultraviolet spectral region, wherein the at least one permanent marking is configured to provide information about at least one of a location on the lens body, wherein the information about the at least one location on the lens body is selected from at least one of: a distance reference point; at least one near reference point; a fitting cross; a prism reference point; and an alignment reference marking. ### Claim 12 (depends on 11) The method according to claim 11, wherein the at least one diffractive structure is generated by at least one of: embedding a photosensitive layer into the lens body and illuminating the photosensitive layer; treating a surface of the lens body by a surface treatment method selected from an additive technology or a subtractive technology; and modifying a refractive index within at least one volume element of the lens body. ### Claim 13 A computer program stored on a non-transitory storage medium and having executable instructions for performing a method for producing a spectacle lens for at least one eye of a user, the method comprising: a) generating a spectacle lens based on instructions configured to compensate at least one ocular aberration of the at least one eye of the user; and b) introducing at least one permanent marking into a lens body of the spectacle lens, wherein the at least one permanent marking is introduced into the lens body such that the at least one permanent marking is or contains at least one diffractive structure, wherein at least one diffractive pattern generated by illumination of the diffractive structure is configured to be invisible upon a first kind of illumination and configured to be visible only upon a second kind of illumination, wherein being visible is a property of the at least one diffractive pattern of being perceived by the at least one eye of the user, and wherein being invisible is a property of the at least one diffractive pattern of not being perceived by the at least one eye of the user, wherein the at least one diffractive pattern is configured to be visible only under illumination in at least one of a near-infrared spectral region and a near-ultraviolet spectral region, wherein the at least one permanent marking is configured to provide information about at least one of a location on the lens body, and wherein the information about the at least one location on the lens body is selected from at least one of: a distance reference point; at least one near reference point; a fitting cross; a prism reference point; and an alignment reference marking. ### Claim 14 A spectacle lens for at least one eye of a user, the spectacle lens comprising: a lens body having at least one permanent marking, wherein the at least one permanent marking is or contains at least one diffractive structure, wherein at least one diffractive pattern generated by illumination of the diffractive structure is configured to be invisible upon a first kind of illumination and configured to be visible only upon a second kind of illumination, wherein being visible is a property of the at least one diffractive pattern of being perceived by the at least one eye of the user, and wherein being invisible is a property of the at least one diffractive pattern of not being perceived by the at least one eye of the user, wherein the at least one diffractive pattern is configured to be visible only under illumination in at least one of a near-infrared spectral region and a near-ultraviolet spectral region, wherein the at least one permanent marking is configured to provide information about at least one of a location on the lens body, wherein the information about the at least one location on the lens body is selected from at least one of: a distance reference point; at least one near reference point; a fitting cross; a prism reference point; and an alignment reference marking, and wherein an incident light beam not containing at least one wavelength in at least one of a near-infrared spectral region and a near-ultraviolet spectral region impinging on the lens body outside the at least one diffractive pattern or on the least one diffractive pattern is transmitted without altering a spectral distribution of the light beam, whereas an incident light beam containing at least one wavelength in at least one of a near-infrared spectral region and a near-ultraviolet spectral region which impinges on the least one diffractive pattern alters the spectral distribution of the light beam. ### Claim 15 (depends on 14) The spectacle lens according to claim 14, wherein the first kind of illumination of the spectacle lens is provided by a large-bandwidth light source, wherein the large-bandwidth light source has a wavelength range above 150 nm. ### Claim 16 (depends on 15) The spectacle lens according to claim 15, wherein the large-bandwidth light source is selected from a natural light source or an artificial light source used for ordinary illumination purposes. ### Claim 17 (depends on 14) The spectacle lens according to claim 14, wherein the second kind of illumination of the spectacle lens is provided by a small-bandwidth light source, wherein the small-bandwidth light source has a wavelength range of at maximum 150 nm. ### Claim 18 (depends on 17) The spectacle lens according to claim 17, wherein the small-bandwidth light source comprises a spectral band having a wavelength range of at maximum 150 nm. ### Claim 19 (depends on 17) The spectacle lens according to claim 17, wherein the small-bandwidth light source is configured to generate light in at least one of a near-infrared spectral region and a near-ultraviolet spectral region. ### Claim 20 (depends on 14) The spectacle lens according to claim 14, wherein the at least one diffractive pattern is configured to be visible only upon illumination at an angle of the second kind of illumination with respect to a surface of the spectacle lens of a maximum of 45° and/or upon being viewed through at least one further optical element. ### Claim 21 (depends on 14) The spectacle lens according to claim 14, wherein the at least one diffractive structure is configured to generate at least one holographic pattern upon the second kind of illumination of the spectacle lens. ### Claim 22 (depends on 14) The spectacle lens according to claim 14, wherein the at least one permanent marking is configured to provide information about an item of information related to the spectacle lens, or an item of information related to the at least one eye of the user. ### Claim 23 (depends on 14) The spectacle lens according to claim 14, wherein the at least one diffractive structure is a volume element comprised by the lens body which occupies at maximum 2% of a volume of the lens body. ### Claim 24 A method for producing a spectacle lens for at least one eye of a user, the method comprising: a) generating a spectacle lens based on instructions configured to compensate at least one ocular aberration of the at least one eye of the user; and b) introducing at least one permanent marking into a lens body of the spectacle lens, wherein the at least one permanent marking is introduced into the lens body such that the at least one permanent marking is or contains at least one diffractive structure, wherein at least one diffractive pattern generated by illumination of the diffractive structure is configured to be invisible upon a first kind of illumination and configured to be visible only upon a second kind of illumination, wherein being visible is a property of the at least one diffractive pattern of being perceived by the at least one eye of the user, and wherein being invisible is a property of the at least one diffractive pattern of not being perceived by the at least one eye of the user, wherein the at least one diffractive pattern is configured to be visible only under illumination in at least one of a near-infrared spectral region and a near-ultraviolet spectral region, wherein the at least one permanent marking is configured to provide information about at least one of a location on the lens body, wherein the information about the at least one location on the lens body is selected from at least one of: a distance reference point; at least one near reference point; a fitting cross; a prism reference point; and an alignment reference marking, and wherein an incident light beam not containing at least one wavelength in at least one of a near-infrared spectral region and a near-ultraviolet spectral region impinging on the lens body outside the at least one diffractive pattern or on the least one diffractive pattern is transmitted without altering a spectral distribution of the light beam, whereas an incident light beam containing at least one wavelength in at least one of a near-infrared spectral region and a near-ultraviolet spectral region which impinges on the least one diffractive pattern alters the spectral distribution of the light beam. ### Claim 25 (depends on 24) The method according to claim 24, wherein the at least one diffractive structure is generated by at least one of: embedding a photosensitive layer into the lens body and illuminating the photosensitive layer; treating a surface of the lens body by a surface treatment method selected from an additive technology or a subtractive technology; and modifying a refractive index within at least one volume element of the lens body. ### Claim 26 A computer program product having executable instructions for performing a method for producing a spectacle lens for at least one eye of a user, the method comprising: a) generating a spectacle lens based on instructions configured to compensate at least one ocular aberration of the at least one eye of the user; and b) introducing at least one permanent marking into a lens body of the spectacle lens, wherein the at least one permanent marking is introduced into the lens body such that the at least one permanent marking is or contains at least one diffractive structure, wherein at least one diffractive pattern generated by illumination of the diffractive structure is configured to be invisible upon a first kind of illumination and configured to be visible only upon a second kind of illumination, wherein being visible is a property of the at least one diffractive pattern of being perceived by the at least one eye of the user, and wherein being invisible is a property of the at least one diffractive pattern of not being perceived by the at least one eye of the user, wherein the at least one diffractive pattern is configured to be visible only under illumination in at least one of a near-infrared spectral region and a near-ultraviolet spectral region, wherein the at least one permanent marking is configured to provide information about at least one of a location on the lens body, wherein the information about the at least one location on the lens body is selected from at least one of: a distance reference point; at least one near reference point; a fitting cross; a prism reference point; and an alignment reference marking, and wherein an incident light beam not containing at least one wavelength in at least one of a near-infrared spectral region and a near-ultraviolet spectral region impinging on the lens body outside the at least one diffractive pattern or on the least one diffractive pattern is transmitted without altering a spectral distribution of the light beam, whereas an incident light beam containing at least one wavelength in at least one of a near-infrared spectral region and a near-ultraviolet spectral region which impinges on the least one diffractive pattern alters the spectral distribution of the light beam.