Abstract: The invention relates to a method of determining an ophthalmic lens for a wearer's eye, the method comprising the following steps: measurement, on the wearer in binocular vision, of the three-dimensional coordinates of the centre of rotation (COR) of the wearer's eye; measurement (10) of at least one viewing direction in a natural posture; determination of the desired position of the ophthalmic lens; calculation of the characteristics of the ophthalmic lens using the measured coordinates and the determined position and the measured direction in the natural posture. Measuring the position of the centre of rotation of the eye in binocular vision ensures that the lens obtained is best adapted for the wearer.

Abstract: An appliance for reading a rim (110) or a half-rim of an eyeglass frame, includes holder elements for holding the eyeglass frame and a feeler (10) that is mounted to turn about an axis of rotation (A1) in order to follow a longitudinal profile (P1) of the rim or half-rim of the eyeglass frame held in the holder elements. The feeler is fitted with a reader head (12) including a V-shaped bearing shoe (15) that is open in a direction facing away from the axis of rotation and that is adapted to be engaged on the rim or half-rim in order to slide therealong.

Abstract: A method of calculating an optical system (OS) of an ophthalmic lens according to a given spectacle frame comprising the steps of: providing geometrical data of the spectacle frame, providing wearer data, and optimization of the optical system (OS) according to at least the criteria consisting of the geometrical data of the spectacle frame, the wearer data and at least one positioning data, so as to generate at least two optical surfaces (S1, S2).

Abstract: A method of preparing an ophthalmic lens for mounting in a surround of an eyeglass frame, the surround presenting a generally profiled shape with an inside face provided with a first engagement ridge or groove and lying between a rear margin for being turned towards the face of the wearer of the eyeglass frame and an opposite front margin, the method including: acquiring the three-dimensional shape of an acquired longitudinal profile running along the inside face; and shaping the ophthalmic lens so as to form on its edge face a second engagement ridge or groove extending along a deduced longitudinal profile of three-dimensional shape calculated as a function of the shape of the acquired longitudinal profile. The method further includes acquiring a geometrical characteristic that relates to the position of the engagement ridge or groove relative to the front and/or rear margin of the frame, the shape of the deduced longitudinal profile then also being calculated as a function of the geometrical characteristic.

Abstract: An appliance for reading a rim (110) or a half-rim of an eyeglass frame, includes holder elements for holding the eyeglass frame and a feeler (10) that is mounted to turn about an axis of rotation (A1) in order to follow a longitudinal profile (P1) of the rim or half-rim of the eyeglass frame held in the holder elements. The feeler is fitted with a reader head (12) including a V-shaped bearing shoe (15) that is open in a direction facing away from the axis of rotation and that is adapted to be engaged on the rim or half-rim in order to slide therealong.

Abstract: A method of calculating an optical system (OS) of an ophthalmic lens according to a given spectacle frame comprising the steps of: providing geometrical data of the spectacle frame, providing wearer data, and optimization of the optical system (OS) according to at least the criteria consisting of the geometrical data of the spectacle frame, the wearer data and at least one positioning data, so as to generate at least two optical surfaces (S1, S2).

Abstract: A method of preparing an ophthalmic lens for mounting in a surround of an eyeglass frame, the surround presenting a generally profiled shape with an inside face provided with a first engagement ridge or groove and lying between a rear margin for being turned towards the face of the wearer of the eyeglass frame and an opposite front margin, the method including: acquiring the three-dimensional shape of an acquired longitudinal profile running along the inside face; and shaping the ophthalmic lens so as to form on its edge face a second engagement ridge or groove extending along a deduced longitudinal profile of three-dimensional shape calculated as a function of the shape of the acquired longitudinal profile. The method further includes acquiring a geometrical characteristic that relates to the position of the engagement ridge or groove relative to the front and/or rear margin of the frame, the shape of the deduced longitudinal profile then also being calculated as a function of the geometrical characteristic.

Abstract: An apparatus comprising a plate for receiving a spectacles lens to be fitted in one of the rims of a spectacles frame selected by a patient, a positioning device arranged above the plate for positioning a gripping member on the spectacles lens, and a screen for displaying an image of the rim in which the lens is to be fitted. The apparatus is combined with imaging means so that the image is imported from the patient wearing the appropriate spectacle frame.

Abstract: A contour reading device, in particular for eyeglass frames, includes a holding arrangement to support a template at a fixed position and a carriage mobile relative to the holding arrangement and carrying a feeler at the end of a rod. To read off the position of a mounting hole in a peripheral area of the template, the device includes a detector arrangement having at least one component constrained to move with the carriage at a given distance from the axis of the rod carrying the feeler, on the same side as a central area of the holding means. Applications include identifying the mounting holes in "drilled mount" eyeglass lenses.

Abstract: A method of checking that a lens suits an eyeglass frame uses the lens grinding machine itself. The lens to be ground is mounted on a support shaft and moved into contact with the grinding wheel with the latter stationary. The support shaft is rotated stepwise until the lens to be ground has rotated through one complete turn. A check is carried out to determine whether a feeler associated with a template is operated thereby during such rotation. The invention finds an application in grinding machines used to trim eyeglass lenses.

Abstract: A device for fastening a holding part on an eyeglass frame placed on a plate comprises an arm adapted to receive removably the holding part and a carriage on which the arm pivots between a raised loading end position and a lowered fitting end position. The carriage is mobile on a frame in a straight line between a retracted rest end position and an advanced end of travel position. A transmission system operative between a drive system and either the arm or the carriage is such that, at least when the carriage is in the vicinity of its advanced end of travel position, the arm is in its retracted fitting position. A locking device is operative between the arm and the carriage to lock the arm releasably to the carriage when in its lowered rest position.

Abstract: A device for fitting a holding part onto an eyeglass lens comprises a plate adapted to receive the eyeglass lens pivoted to a fixed base and a calibrated spring arrangement and a displacement sensor operative between the plate and the base.

Abstract: A device for fastening a holding part on an eyeglass lens placed on a plate comprises an arm adapted to receive removably the holding part and a carriage on which the arm is able to pivot between a loading and offloading position and a fitting position. The carriage is mobile on a frame between a rest position and an end of travel position over a path on which the arm is brought into alignment in the fitting position with the plate. The carriage is at least in part adapted to move in a straight line in a first direction controlled by a guide fastened to the frame and the pivot axis of the arm is in a second direction orthogonal to the first direction. A belt and gear transmission is operative between the carriage and the arm to move the arm from one end position to the other.

Abstract: A device for fitting a handling block to an eyeglass lens to which the handling block adheres temporarily includes a receptacle into which the handling block is push-fitted. An ejector system associated with the receptacle facilitates disengagement of the handling block from the receptacle after it is fitted to the lens. This system is operative outside the receptacle and engages operatively on the eyeglass lens concerned. It comprises two ejector fingers movable parallel to the axis of the receptacle against return springs.

Abstract: An opthalmic lens centering device comprises a frame on which is a translucent first support plate which receives an opthalmic lens to be centered. There is a frosted screen at the base of the first support plate. A projector system above the first support plate projects an image of the ophtlalmic lens onto the frosted screen. A first observation channel and an opening in the frame enable an operator to view the frosted screen. A second support plate receives a template with which the opthalmic lens is to be compared. A second observation channel in conjunction with the same opening in the frame enables the operator to view the second support plate. The first and second observation channels have a common emergent section of which the opening in the frame forms part. There is a recess in the frame, opening onto its front surface, by means of which the second support plate is disposed at the front of the frame.

Abstract: Device for measuring the ocular parameters of a patient, especially parameters for mounting ophthalmic lenses on a spectacle frame with a view to their adaptation to the patient, wherein a reference mark assembly includes two pairs of height reference marks respectively associated to the two eyes of the patient, and distance reference marks each associated to a lateral mirror so as to receive the profile image of the eye of the patient and of the lens and its associated rim and wherein the device further includes a measuring device to evaluate the position of the different above-mentioned reference marks with respect to the patient's eyes, to the lens and associated rim, and to visualize the results of this evaluation.

Abstract: Luminous source of device for measuring, by means of corneal reflections, the ocular parameters of a subject.The source comprises a first extended emitting zone globally annular adapted to produce on the cornea of each eye of the subject a reflection observable by the operator of the device and a second punctual emitting zone disposed at the centre of the first emitting zone and constituting the fixation point of the subject's stare.

Abstract: A device for measuring a subject's ocular parameters, in particular the interpupillary distance, comprises a front plate against which the face of the subject is placed, comprising two windows substantially corresponding to the lenses of a pair of eyeglasses. A lens is movable along its optical axis, which is perpendicular to the front plate, from an origin position near the front plate. A viewing eyepiece is disposed at the focus of the lens when in the origin position. A semi-reflecting mirror disposed at 45.degree. renders the eyepiece and a point source coincident, as far as the subject is concerned. Parallel to the semi-reflecting mirror, another mirror reflects an image of a cathode ray tube screen to the eyepiece through another lens. Adjustable calibrated voltage sources are used to produce coincidence of the reflections of the source on the corneas of the eyes of the subject and the luminous traces on the screen of the cathode ray tube, as seen by an operator looking through the eyepiece.

Abstract: Apparatus for determining the diameter of an unprocessed ophthalmic lens to fit a particular eyeglass frame comprises a base and a guide on the base adapted to receive a card carrying diagrams of available lenses. A support on the base is adapted to receive the eyeglass frame to be fitted with lenses. The card guide is fixed relative to the base and comprises an elongate slot adapted to allow the card to slide within it. The frame support is mobile relative to the card guide in the direction at right angles to the slot.