Abstract: The present disclosure relates to a method and device for evaluating a fit of visual equipment. In an embodiment, the method (105) includes receiving (110) an image(s) of a face of a user, identifying (115) a subset of eyeglasses from a database that satisfy a preliminary fit threshold, determining (120) an eyeglass rim plane of a candidate eyeglass, determining (125) an eyeglass pads plane of the candidate eyeglass, generating (130) at least one 2D profile of a nose of the user, generating (140) at least one 2D profile of a nasal section of a frame of the candidate eyeglass, virtually docking (150) the candidate eyeglass on the nose of the face of the user, calculating (170), when the virtually docked candidate eyeglass satisfies a secondary fit threshold, a final fit of the virtually docked candidate eyeglass, the final fit being defined by at least one of a comfort criterion and/or an aesthetic criterion.

Abstract: This method for retrieving at least one optical parameter of an ophthalmic lens comprises: obtaining an image of a first and second patterns by using an image capture device located at a first position; from that image, obtaining a first set of data from at least a part of the first pattern that is seen through the lens by the image capture device and obtaining a second set of data from at least a part of the second pattern that is seen directly i.e. outside the lens by the image capture device; retrieving the at least one optical parameter by using the first and second sets of data and taking account of relative positions of the image capture device, the lens and the first and second patterns.

Abstract: A method for determining an ophthalmic element adapted to a wearer, the wearer having a prescription. The method including at least providing an initial set of ophthalmic elements, each ophthalmic element of the initial set being adapted to the prescription of the wearer, for each ophthalmic element of the initial set, calculating a value of each criterion of a plurality of criteria, the plurality of criteria comprises a plurality of lens criteria and/or a plurality of wearer criteria, generating an optimal set of ophthalmic elements by computing pareto-optimal ophthalmic elements among the ophthalmic elements of the initial set based on the value of each criterion, and determining one final ophthalmic element for the wearer in the optimal set of ophthalmic elements based on selected criteria based on wearer's preferences.

Abstract: A method is provided for providing a selection chart of non-prescription ophthalmic lenses. The method comprises providing at least one optical performance parameter threshold (OPPT) associated to an optical performance parameter (OPP); choosing the selection criterion (SC) among the selection criteria of the list consisting of: lens base curve; lens pantoscopic angle; and lens wrap angle; choosing a selection criterion range (SCR) for each of the chosen selection criterion; calculating selection domains (SD) defined by sub-ranges for each of the chosen SC within the SCR so as to determine and associate in each SD a single non-prescription ophthalmic lens with a spherical front surface, a complex back surface and a lens base curve. All the chosen OPPs are equal or less to the OPPT for all values of the SC within the SD associated to the single non-prescription ophthalmic lens.

Abstract: Ophthalmic lenses intended to be worn by non-presbyopic wearers, such as single-vision ophthalmic lenses. The lenses exhibit reduced distortion as perceived by the wearer.

Abstract: A method is provided for providing a selection chart of non-prescription ophthalmic lenses. The method comprises providing at least one optical performance parameter threshold (OPPT) associated to an optical performance parameter (OPP); choosing the selection criterion (SC) among the selection criteria of the list consisting of: lens base curve; lens pantoscopic angle; and lens wrap angle; choosing a selection criterion range (SCR) for each of the chosen selection criterion; calculating selection domains (SD) defined by sub-ranges for each of the chosen SC within the SCR so as to determine and associate in each SD a single non-prescription ophthalmic lens with a spherical front surface, a complex back surface and a lens base curve. All the chosen OPPs are equal or less to the OPPT for all values of the SC within the SD associated to the single non-prescription ophthalmic lens.

Abstract: Method for optimizing an optical surface comprising: an initial optical surface providing step, a working optical surface defining step, during which a working optical surface is defined to be equal to the initial optical surface, a first surface cost function providing step, during which a first surface cost function of the nth derivative of the surface is provided, a set of surface cost functions providing step, during which a set of surface cost functions function of at least one criterion over evaluation zones is provided, a global surface cost function evaluation step during which a global surface cost function equal to a weighted sum of the previous cost functions is evaluated, a modifying step, during which the working surface is modified, wherein the evaluation and modifying steps are repeated so as to minimize the global surface cost function.

Abstract: Method implemented by computer means for optimizing a measured contour of an opening of a spectacle frame, the method comprising: a contour data providing step, a working contour defining step, during which a working contour of the spectacle frame is defined, a first contour cost function providing step, during which a first contour cost function function of the mth derivative of the curve of the contour is provided, a set of contour cost functions providing step, during which a set of contour cost functions is provided, a global contour cost function evaluation step during which a global contour cost function is evaluated, a contour modifying step, during which the working contour is modified, wherein the global contour cost function evaluation and contour modifying steps are repeated so as to minimize the global contour cost function.

Abstract: Ophthalmic lenses intended to be worn by non-presbyopic wearers, such as single-vision ophthalmic lenses. The lenses exhibit reduced distortion as perceived by the wearer.

Abstract: The invention relates to a method for determining an ophthalmic lens wherein: a first and a second reference axes are determined, the first reference axis is comprised between [?T?20°, ?T+20° ] with ?T being the mean axis of astigmatism over a first temporal portion, and the second reference axis is comprised between [?N?20°, ?N+20° ] with ?N being the mean axis of astigmatism over a second nasal portion; a combined reference axis is determined as a linear combination of the first and second reference axes; over the first portion, the sphere value along the combined reference axis is greater than the sphere value along a perpendicular axis to the combined reference axis; and over the second portion, the sphere value along the combined reference axis is greater than the sphere value along a perpendicular axis to the combined reference axis.

Abstract: Method for determining a progressive ophthalmic lens wherein: a first or a second reference axes (?1, ?2) are determined, the first reference axis being set to a value comprised between [?T?20°, ?T+20°] with ?T being the average axis of astigmatism over a first temporal portion, and the second reference axis being set to a value comprised between [?N?20°, ?N+20°] with ?N being the average axis of astigmatism over a second nasal portion; over the first portion, the sphere value along the first reference axis is superior to the sphere value along a perpendicular axis to the first reference axis (SPH(?1))>SPH(??1)); or over the second portion, the sphere value along the second reference axis is superior to the sphere value along a perpendicular axis to the second reference axis ((SPH(?2))>(SPH(??2)).

Abstract: Method for optimizing an optical surface comprising: an initial optical surface providing step, a working optical surface defining step, during which a working optical surface is defined to be equal to the initial optical surface, a first surface cost function providing step, during which a first surface cost function of the nth derivative of the surface is provided, a set of surface cost functions providing step, during which a set of surface cost functions function of at least one criterion over evaluation zones is provided, a global surface cost function evaluation step during which a global surface cost function equal to a weighted sum of the previous cost functions is evaluated, a modifying step, during which the working surface is modified, wherein the evaluation and modifying steps are repeated so as to minimize the global surface cost function.

Abstract: Method implemented by computer means for optimizing a measured contour of an opening of a spectacle frame, the method comprising: a contour data providing step, a working contour defining step, during which a working contour of the spectacle frame is defined, a first contour cost function providing step, during which a first contour cost function function of the mth derivative of the curve of the contour is provided, a set of contour cost functions providing step, during which a set of contour cost functions is provided, a global contour cost function evaluation step during which a global contour cost function is evaluated, a contour modifying step, during which the working contour is modified, wherein the global contour cost function evaluation and contour modifying steps are repeated so as to minimize the global contour cost function.

Abstract: The subject of the present invention is a method and a system for measuring the geometric or optical structure of an optical component.

Abstract: A method implemented by computer means for calculating by optimization an optical system for example an ophthalmic lens according to at least one criterion among the following list consisting of: ocular deviation, object visual angular field in central vision, image visual angular field in central vision, pupil field ray deviation, object visual angular field in peripheral vision, image visual angular field in peripheral vision, prismatic deviation in peripheral vision, magnification in peripheral vision, lens volume, magnification of the eyes, temple shift, or a variation of preceding criteria.

Abstract: A method for calculating a system by optimization, the method comprising the steps of: i. providing a set of system parameters so as to define a starting system, each system parameter being set up at a starting value; ii. defining a plurality of criteria; iii. associating for each criterion a cost function; iv. defining a plurality of global cost functions by associating to each global cost function at least one cost function; v. defining a vector of variable parameters associated to each global cost function by selecting for each vector of variable parameters at least one system parameter; vi. optimizing the plurality of global cost functions by modifying the values of the system parameters of the vectors of variable parameters so as to obtain an intermediate system; repeating step vi. until an equilibrium is reached so as to obtain a system.

Abstract: A method of generating a target surface {tilde over (S)}( ?) of an optical lens for the manufacture of the optical lens according to optical lens parameters ?, the method comprising: providing a set of L first surface difference data E(?j) each first surface difference data E(?j) corresponding to the surface difference between a pre-calculated surface S?jpc(??j) (j=1, . . . , L) and an initial surface S?jini (j=1, . . . , L), from which the target surface will be generated, according to the expression: E(?j)=S?jpc(??j)?S?jini (j=1, . . . , L) where ?j (j=1, . . .

Abstract: The subject of the present invention is a method and a system for measuring the geometric or optical structure of an optical component.

Abstract: Method for providing an optical system (OS) of an ophthalmic spectacle lens according to wearer's prescription data and wearer's optical needs with the provision that a wearer's optical need is not related to prescription data, where said optical system (OS) is defined by at least a front and a back surfaces (S1, S2) and their relative position, comprising the steps of: providing a semi-finished lens blank (SB); (a) providing contour data (CD); choosing at least one localized optical feature (LOFi) suitable for the wearer's needs; positioning the contour data (CD) wherein the semi-finished lens blank comprises: a first surface (SB1) having in each point a mean sphere value (SPHmean) and a cylinder value (CYL), a second unfinished surface, the first surface (SB1) comprising: a main area; t least a peripheral area (Ai).

Abstract: Method for providing an optical system (OS) of an ophthalmic spectacle lens according to wearer's prescription data and wearer's optical needs with the provision that a wearer's optical need is not related to prescription data, where said optical system (OS) is defined by at least a front and a back surfaces (S1, S2) and their relative position, comprising the steps of: a) providing a semi-finished lens blank (SB); b) providing contour data (CD); c) choosing at least one localized optical feature (LOFi) suitable for the wearer's needs; d) positioning the contour data (CD) wherein the semi-finished lens blank (SB) comprises: a first surface (SB1) having in each point a mean sphere value (SPHmean) and a cylinder value (CYL), a second unfinished surface, the first surface (SB1) comprising: a plurality of primary areas (Ai); border areas (Bi); and a secondary area.