Essilor International (compagnie Generale D'optique)

Essilor International

Philippe Pinault

Ahmed Haddadi

Thierry Bonnin

Gildas Marin

Guillaume Giraudet

Isabelle Poulain

Fabien Divo

Cécile Petignaud

Marius Peloux

Stephane Boutinon

Stéphane Boutinon

Cédric Lemaire

David Tang

Didier Grand-Clement

Adèle Longo

Laurent Roussel

Christophe Condat

Adéle Longo

Yones Sidiq De Labrusse

Yonès Sidiq De Labrusse

A method for measuring a distance separating a camera from a reference object including a predetermined number of corners arranged in a pattern and at least two reference points separated by a reference length. The method includes acquiring an image including the reference object with the camera, detecting corners in the image, attributing a class to each corner, based on an orientation of the corner, detecting the reference object in the image based on the corners and attributed classes, placing the reference points in the image based on the corners of the reference object and measuring an imaged length separating the reference points, and comparing the reference length to the imaged length and obtaining the distance separating the camera from the reference object.

Method for measuring a distance separating a camera from a reference object

A method and associated instrument in which an optical system is switched from a first to a second refractive power states, to provide a first, and then a second refraction correction to an eye of a subject, the switching being carried on without interrupting a light beam coming from a target object and transmitted by the optical system to the eye of the subject. The switching is carried on in order to circumvent an intermediate refraction correction that is in between said first and second refraction corrections, or with a speed higher than a given limit.

Method and instrument for providing at least one eye of a subject with a first refraction correction and with a second refraction correction to be compared with each other

A process, phoropter, and an optometry system, the process being for correction of the shift of the optical power of an active lens in a phoropter due to a temperature change over time, the active lens including a container filled with a liquid and having a deformable curvature membrane under the action of an actuator controlled by an optical power control command, the shift being that the active lens provides an actual optical power that is different from the expected optical power corresponding to the optical power control command. A temperature sensor is arranged in and/or on the phoropter to measure the temperature in the phoropter.

Process of correction of the shift due to temperature of the optical power of an active lens of a phoropter and related phoropter and optometry system

Disclosed is an apparatus for measuring subjective ocular refraction including a display device configured to display a least one optotype and a refractive optical system arranged between an eye of a viewer and the display device, the refractive optical system having an optical power that can be varied according to a determined minimum step. The display device further includes a unit for varying optical power designed to generate a variation in the spherical and/or cylindrical optical power, such that the display device and the refractive optical system form a first image of the optotype with a first total optical power and, respectively, a second image of the optotype with a second total optical power, the variation in optical power between the first total optical power and the second total optical power being less than the determined minimum step.

Apparatus and method for measuring subjective ocular refraction with high-resolution spherical and/or cylindrical optical power

The invention relates to a method for measuring the geometric morphometric parameters of a person wearing glasses (), said method implementing an independent computing device () comprising a screen, a target (), a compact image acquisition system () which is provided with a means of determining the inclination thereof, said system () being connected to said screen, and a computer for controlling the image acquisition system () and processing the images obtained. The main feature of a measuring method according to the invention is that it comprises a step in which the person observes the target () placed in a position known to the image acquisition system (), by rolling his or her head in an upward direction while keeping his or her eyes fixed on the target ().

Method for measuring the geometric morphometric parameteres of a person wearing glasses

A method of measuring morpho-geometrical parameters of a person wearing eyeglasses includes causing the person to observe a point situated in front at infinity while holding the head naturally on a direction () that is substantially horizontal, acquiring a first image of the position of the frame () in this first posture, causing the person to observe the target () placed in a known position relative to the image acquisition system, by adopting a position that is natural and comfortable and that involves at least a tilting movement of the head; acquiring a second image of the position of the frame () in this second posture, determining the positions of the eyes () from one of the two images, computer processing of the two images obtained in order to determine the morpho-geometrical parameters of the person, and delivering the results of the measurements.

Method of measuring morpho-geometrical parameters of a person wearing eyeglasses

A method of shaping an ophthalmic lens to have a desired outline with a machining device including a blocking support for the ophthalmic lens and at least one first machining tool, the method includes:

Method for shaping an ophthalmic lens for eyeglasses

Apparatus for acquisition of facial parameters

The device includes: bearing element () for the lens (); element () for acquiring a global image () of the drill hole () of the lens () in a lighting direction (D, A), or image acquisition direction (A); element () for processing the image when the lens is carried by the carrier element (). The processing element () designed for determining, from the global image of the drill hole () the position of center (C) of the opening of the drill hole () that gives onto one of the faces () of the lens () and/or the transverse dimension of the opening of the drill hole () that corresponds to the desired transverse dimension (D).

Device for determining the position and/or the transverse dimension of a drill hole in a presentation lens for rimless eyeglasses

Method of determining the position of a target drill hole to be drilled in a target corrective lens having an expected target outline after shaping, the position being determined from a reference lens having a reference outline and at least one reference drill hole, the method includes: acquiring an image and at least one characteristic of the curvature of the reference lens; determining, in the acquisition plane, the reference distance in projection between the projection of a reference anchor point of the associated reference lens and the reference lens and the projection of a reference drilling point of the reference drill hole calculating the three-dimensional reference distance between the reference anchor point and the reference drilling point as a function of the characteristic of the curvature of the reference lens () and of the determined reference distance; and determining the position of the target drilling point for the target drill hole of the target corrective lens as a function of the calculated three-dimensional reference distance (R; R).

Method of determining the position of a drill hole to be drilled on an ophthalmic lens

A device for measuring at least one camber geometrical characteristic of an ophthalmic lens provided on at least one of its faces with at least one position-identifying mark, the device including a support for the ophthalmic lens, and on opposite sides of the support, firstly lighting element for lighting the ophthalmic lens along at least two different lighting directions, and secondly acquisition and analysis element for acquiring and analyzing the light transmitted by the ophthalmic lens, the analysis element being adapted to identify shadows of the mark when lighted in the at least two lighting directions, and to deduce from their positions a measured value for the camber geometrical characteristic of the ophthalmic lens.

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Charenton-le-Pont, France

Philippe Pinault