Essilor International

Essilor International (Compagnie Generale D'optique)

Essilor International Cie Generale D'optique

Jean-Pierre Chauveau

Gilles Le Saux

Pascal Allione

Konogan Baranton

Jérôme Moine

Bruno Decreton

Xavier Bultez

Christian Harsigny

Guillaume Bolteau

Daniel Steigelmann

Cyril Guilloux

Michel Nauche

Frédéric Dubois

Claude Pedrono

Christian Joncour

Bernard Bourdoncle

Sebastien Fricker

Sebastien Maurice

Helene De Rossi

Francoise Ahsbahs

Melanie Tessieres

Jérome Moine

Sandrine Francois

Christian Miege

Daniel Steigelman

Denis Mazuet

Alain Coulon

Pierre Bercher

Fabienne Lievois

Alain Dubois

Sebastien Evain

Jean-Paul Deforges

Sébastien Evain

A method for evaluating an ophthalmic lens for a given wearer according to a visual performance parameter includes providing wearer's data for the given wearer. The method further includes providing a visual performance parameter tolerance range for the wearer. The method further includes providing an ophthalmic lens to be evaluated, the ophthalmic lens being characterized by opto-geometrical features. The method further includes computing a value of the visual performance parameter for the lens to be evaluated on the basis of a model. The method further includes evaluating the ophthalmic lens by comparing the computed value of the visual performance parameter with the visual performance parameter tolerance range.

Method for evaluating an ophthalmic lens; associated evaluation system and industrial assembly for manufacturing an ophthalmic lens

Disclosed is a method for determining location of a lens machining tool () having an offset location according to a first direction (Y) smaller than a first predetermined threshold, including the steps of manufacturing a calibration piece () according to a predetermined theoretical geometry by using the lens machining tool for providing a at least partially annular groove in a main surface of the calibration piece, the at least partially annular groove being configured to form at least one sharp edge defining a slope discontinuity on the main surface; measuring a distance between the at least one sharp edge and a turning center of the calibration piece for providing data of geometrical characteristics of the calibration piece; and deducing from the measured data a location of the lens machining tool according to a second direction (X) distinct from the first direction.

Method for determining location of a lens machining tool in a turning machine configured for machining ophtalmic lenses

Disclosed is a method for deducing geometrical defects of an optical article turning machine, including a defect value deducing step, during which at least one geometrical defect value is deduced based at least on an indicative information of an optical and/or geometrical data related to an optical and/or geometrical characteristic of a checking piece ().

Method for deducing geometrical defects of an optical article turning machine

Method for determining the feasibility of an ophthalmic lens by an ophthalmic lens manufacturing process comprising: an ophthalmic lens data providing step, a set of surface parameters providing step, an optical parameters providing step during which a set of n optical parameters (P, P, . . . , P) is provided, n being an integer greater than or equal to 1, each optical parameter Pbeing provided with a tolerance value &#x3b5;, &#x2014;a feasibility check determining step, during which the feasibility of the ophthalmic lens by the ophthalmic lens manufacturing process is determined by determining if for i from 1 to n: the value of the derivative of Pwith respect to the jth surface parameter &#x3b1;on the nominal surface and &#x394;&#x3b1;the value of the jth surface parameter and Aa combination of terms of order greater or equal to 2 for each P.

Method for determining the feasibility of an ophthalmic lens

Method for determining the values of a set of n optical parameters (P, P, . . . , P) of an ophthalmic lens, n being an integer greater than or equal to 1, the method comprising: an nominal ophthalmic lens data providing step, an ophthalmic lens providing step, an optical surface measuring step, a surface errors determining step during which a set of m surface error parameters (&#x3b1;, &#x3b1;, . . . , &#x3b1;) is determined, m being an integer greater than or equal to 1, an optical parameter determining step during which each optical parameter of the set of optical parameters is determined by: with Pthe value of the ith optical parameter of the manufactured optical lens, Pthe value of the ith optical parameter of the nominal optical lens, the value of the derivative of Pwith respect to the jth surface error parameter &#x3b1;on the nominal surface and &#x394;&#x3b1;the value of the jth surface error parameter, and Aa combination of terms of order greater or equal to 2 for each P.

Method of determining optical parameters of an ophthalmic lens

The present disclosure provides systems and methods for determining an ophthalmic lens. In one implementation, three-dimensional coordinates of a center of rotation of the wearer's eye measured on the wearer in binocular vision are received. At least one direction of gaze measured in a natural posture and a determined position of the ophthalmic lens are received. Characteristics of the ophthalmic lens are calculated by using the coordinates measured for the center of rotation of the eye, the determined position of the lens, and the at least one direction of gaze measured in a natural posture. The characteristics of the ophthalmic lens are calculated by positioning a starting ophthalmic lens in the determined position and modifying the starting ophthalmic lens by wavefront analysis and/or optimizing using ray tracing dependent on the coordinates measured for the center of rotation of the eye and the determined position of the lens.

Method of determining an ophthalmic lens

Determining position parameters defining relative position of a manufactured derivable surface relative to a reference surface, the process comprising: providing a nominal surface expressed in a nominal frame of reference and corresponding to the theoretical derivable surface to be manufactured with the nominal value of the position parameters defining the relative position of the nominal surface relative to the reference surface, providing a measured surface of the manufactured derivable surface expressed in the nominal frame of reference, providing at least one deformation surface defined by at least one deformation adjustable parameter, determining a composed surface by adding the measured surface and the deformation surface, determining the position parameters and at least one deformation parameter by minimizing the difference between the nominal surface and the composed surface.

Process for determining position parameters of a manufactured surface relative to a reference surface

Method for determining at least one geometric postural parameter when fitting a corrective spectacle frame on the face of a wearer in the anatomical posture thereof

The invention relates to a method of calculating an optical system (OS), the optical system (OS) being identified by a function (OF), the optical system (OS) comprising a first part (F) defined by a first equation (EF) and a second part (F) defined by a second equation (EF), the method comprising: &#x2014;a generating step (GEN), in which a virtual optical system (VOS) is used to generate a virtual function (VOF); &#x2014;a modification step (MOD), in which the virtual function (VOF) is modified so as obtain the function (OF); &#x2014;a calculation step (CAL), in which the second equation (EF) is calculated from the function (OF), and the first equation (EF). The invention relates also to a method of manufacturing an optical system (OS).

Method of manufacturing an optical system

The present invention relates in general to taking geometrico-morphological measurements on a subject. More particularly, the invention relates to a method of measuring the position of a remarkable point of the subject's eye. The method includes amongst others, the steps of capturing images in different relative postures (APIV, APIV, (O,X,Y,Z), (O,X,Y,Z)) of a subject, identifying reference points of the eye ((RCG, RCD), (RCG, RCD)), and calculating the remarkable point (CROD, CROG) as a function of the captured images. The values of the posture parameter (APIV) are obtained by a position-identification element () having at least one known geometrical characteristic that is placed on the subject's head. Each captured image contains a representation of the position-identification element (). The posture parameter is thus calculated as a function of these images and of the known geometrical characteristic.

Method of measuring the position, in a horizontal direction in the sagittal plane, of a remarkable point of an eye of a subject

A device and method for determining under wearing conditions at least one component of the orientation of a correcting ophthalmic lens of eyeglasses relative to the head of a future wearer. Provision is made for mounting a position-identification system () on the frame () and/or on a presentation lens fitted to the frame, which system includes at least one identification element () having at least one known geometrical characteristic, for capturing the image of the identification element in two dimensions in a vertical facial plane, for processing the captured image to measure the captured geometrical characteristic of the image of the identification element that depends on the known geometrical characteristic of the identification element, and for calculating at least one component of the orientation of the lens by comparing the captured geometrical characteristic with the known geometrical characteristic. A method of optically designing the correcting lens is disclosed.

Method and a device for determining the orientation of a correcting ophthalmic lens, and a method of optically designing the correcting lens

A method for machining a face () of an optical object (), includes providing a machine tool which itself includes a bed () for locating an object to be machined. The bed () has a receiving surface () that is angularly adjustable about an axis perpendicular to the receiving surface (). A spindle () is suitable for rotating a machining tool () about an axis essentially parallel to the receiving surface () of the bed () and is suitable for moving the machining tool () translationally in a plane essentially parallel or perpendicular to the receiving surface () of the bed ().

Method and machine tool for machining an optical object

A method of capturing a substantially front-view image of the face of a wearer wearing at least one frame (), the image being captured by an image-capture appliance (), and calculating the geometrico-physiognomic parameter (H, TETA) by processing the captured image. The calculation of the geometrico-physiognomic parameter (H, TETA) includes identifying in the image the image of a predetermined remarkable point (RC) that is directly or indirectly associated with the wearer's face or with the frame, and it takes into consideration a magnitude representative of the absolute vertical angle of observation (GAMMA) formed between firstly an observation line (DO) connecting the pupil () of the image-capture appliance () to the remarkable point (RC), and secondly its projection onto a horizontal plane (PF).

Method of measuring at least one geometrico-physiognomic parameter for positioning a vision correcting eyeglass frame on the face of a wearer

The optical system presents accommodation compensation, the system including in combination two multifocal lenses, one of them being an aperture lens and the other a field lens.

Optical accommodative compensation system

Progressive multifocal ophthalmic lens having a power addition prescription and presenting a complex surface having a fitting cross and a principal meridian of progression. The lens has, when being worn, a normalized reduced root mean square deviation of less than 0.025 microns per diopter over a zone that includes the far vision control point and covering a sector whose apex lies 4&#xb0; below the fitting cross with an angular aperture of between 150&#xb0; and 160&#xb0;; and a progression length of 25&#xb0; or less, the progression length being defined as the angle of lowered of the view direction from the fitting cross down to the point on the meridian for which the wearer's optical power reaches 85% of the addition prescription. The lens is suitable for increased far vision with good accessibility to near vision.

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Charenton le Pont, France

Jean-Pierre Chauveau