Essilor International (Compagnie Generale D'optique)

Essilor International

Fabien Muradore

Hélène De Rossi

Cyril Guilloux

Pascal Allione

Ning Wang

Jérôme Moine

Carlos Rego

Sebastien Fricker

Guillaume Broutin

Pauline Colas

Sébastien Fricker

Helene De Rossi

Asma Lakhoua

Stephane Gueu

Nicolas Lavillonniere

Diane De Gaudemaris

Samy Hamlaoui

Stéphane Gueu

Florian Caleff

Arnaud Susset

Nicolas La Villonniere

Jordan Brouns

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.

Method and system for retrieving an optical parameter of an ophthalmic lens

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.

Method for providing a selection chart of nonprescription ophthalmic lenses

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.

Lenses with improved management of distortion

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.

Method for optimizing an optical surface

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.

Method for optimizing a measured contour of a spectacle frame

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 [&#x3b3;&#x2212;20&#xb0;, &#x3b3;+20&#xb0; ] with &#x3b3;being the mean axis of astigmatism over a first temporal portion, and the second reference axis is comprised between [&#x3b3;&#x2212;20&#xb0;, &#x3b3;+20&#xb0; ] with &#x3b3;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.

Method for determining an ophthalmic lens

Method for determining a progressive ophthalmic lens wherein: a first or a second reference axes (&#x393;, &#x393;) are determined, the first reference axis being set to a value comprised between [&#x3b3;&#x2212;20&#xb0;, &#x3b3;+20&#xb0;] with &#x3b3;being the average axis of astigmatism over a first temporal portion, and the second reference axis being set to a value comprised between [&#x3b3;&#x2212;20&#xb0;, &#x3b3;+20&#xb0;] with &#x3b3;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(&#x393;))&#x3e;SPH(&#x22a5;&#x393;)); 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(&#x393;))&#x3e;(SPH(&#x22a5;&#x393;)).

Method for determining a progressive ophthalmic lens

The subject of the present invention is a method and a system for measuring the geometric or optical structure of an optical component. In particular, the invention relates to a method for measuring the geometric structure of a component bounded by a first side () and a second side (), said method comprising steps of: (S) measuring a first signal (MS) resulting from a first conversion of a first probe signal (PS), by at least said first side (); (S) measuring a second signal (MS) resulting from a second conversion of a second probe signal (PS), by at least said second side (); (S) determining a third conversion making it possible to convert a first set of coordinates (R) associated with the measurement of the first signal (MS) to a second set of coordinates (R) associated with the measurement of the second signal (MS); (S) estimating said first side () using the first signal (MS), said first simulation and a first cost criterion (V) quantifying a difference between the estimation (FS) and the first signal (MS); and (S) estimating said second side () using the second signal (MS), said second simulation, said third conversion and a second cost criterion (V) quantifying a difference between the estimation (ES) and the second signal (MS).

Method and tool for measuring the geometric structure of an optical component

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.

Optical system determination according to advanced criteria

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.

Method for calculating a system, for example an optical system

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(&#x3bb;) each first surface difference data E(&#x3bb;) corresponding to the surface difference between a pre-calculated surface S(&#x3b1;) (j=1, . . . , L) and an initial surface S(j=1, . . . , L), from which the target surface will be generated, according to the expression:(&#x3bb;)=(&#x3b1;)&#x2212;(j=1, . . . , L)where &#x3bb;(j=1, . . . , L) correspond to the optical lens parameters of the pre-calculated optical lenses; providing a set of second surface difference data {tilde over (E)}() corresponding to the surface difference between the target optical surface {tilde over (S)}() and the initial surface Sby linear interpolation of the first surface difference data E(&#x3bb;) according to the expression: where wrepresents an interpolation coefficient; and; determining the target surface {tilde over (S)}() by combining the second surface difference data {tilde over (E)}() and the initial surface Saccording to the expression: {tilde over (S)}()={tilde over (E)}()+S.

Method and apparatus for generating a surface of an optical lens

A method for determining an ophthalmic lens includes choosing an initial lens with a first face and a second face and defining an initial surface for the second face of the lens with a central zone of diameter Dand a peripheral zone of inner diameter Dgreater than the diameter Dof the central zone, each point of the central zone and the peripheral zone having an altitude defined with respect to an axis (Z) normal to the second face of the lens and having the centre of the central zone as its origin, the altitude of the peripheral zone being defined as the minimum of the points situated on the diameter D; the peripheral zone having a maximum radius of curvature comprised between the maximum radius of curvature of the first face and the maximum radius of curvature of the central zone.

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Charenton le Pont, France

Fabien Muradore