Abstract:
The invention concerns a system (100) for determining refraction features of both first and second eyes of a subject. According to the invention, the system (100) comprises a light field display device (60), a system of localisation (6) of the positions of the first and second eyes of the subject (10), the light field display device being configured to generate a first light field (71) directed selectively toward the first eye (1), and, respectively, a second light field (72) directed selectively toward the second eye (2), a control unit adapted to adjust said first light field as a function of at least a first refraction parameter associated with at least a first optical aberration for said first eye and the control unit being adapted to adjust said second light field as a function of at least a second refraction parameter associated with at least a second optical aberration for the second eye.
Abstract:
The invention concerns a method comprising the steps of: a) illuminating a pupil (30) of the (3) eye of a subject by means of a light source (12); b) acquiring at least one picture of said pupil comprising an image of the reflection of said light source on the retina of said eye, by means of an image-capture apparatus (10); c) determining a refraction feature of said eye from at least a geometrical feature, a positional feature, or an intensity distribution of said image of the reflection of said light source wherein optical distances (d source , d cam ) between said pupil and, respectively, said light source and said image-capture apparatus, are different. An associated device (8) is also described.
Abstract:
The invention is related to a measurement method for determining a value of a visual correction need for near vision of an individual in a natural posture for near vision wherein a recognizing limit distance is determined so that the individual is able to recognize at least one predetermined symbol disposed farther than said limit distance relatively to the individual and unable to recognize said at least one predetermined symbol disposed closer to the individual than said limit distance, wherein a portable medium displaying said at least one predetermined symbol is displaced in front of the face and eyes of the individual to change a frontal distance between his/her eyes and the portable medium and in which when a recognizing limit distance is detected by the individual, said limit distance is measured and the value of the visual correction need is determined from said measured limit distance, wherein said visual correction need comprises an accommodation compensation need.
Abstract:
L'invention concerne un procédé de détourage d'une lentille ophtalmique (10; 20) de lunettes suivant un contour souhaité (E, F), la lentille (10; 20) comportant un substrat (11; 21) et un film de revêtement (12; 22). De procédé composte une étape de découpe de la lentille (10; 20) au moyen d'un premier outil (30; 40) sur au moins l'épaisseur du film de revêtement (12; 22), cette découpe épargnant intérieurement une partie centrale (12A; 22A) utile du film de revêtement (12; 22) présentant un contour réduit (C; D) par rapport à celui de la lentille d'origine, fermé et calculé en fonction dudit contour souhaité (E; F). Suivie par une étape de taillage du chant du substrat (11; 21) suivant ledit contour souhaité (E; F), au moyen d'un second outil (31; 41), sans usinage de cette partie centrale (12A; 22A) et une étape ultérieure de finition du chant du substrat (11; 21), sans usinage de cette partie centrale (12A; 22A).
Abstract:
L'invention concerne un procédé de centrage d'une lentille ophtalmique (10) sur une monture de lunettes (20), comportant le positionnement d'un référentiel de la lentille ophtalmique par rapport à un référentiel de la monture de lunettes. Selon l'invention, ledit positionnement est réalisé en fonction d'au moins une valeur caractéristique de la cambrure de la monture et/ou de la cambrure de la lentille ophtalmique.
Abstract:
La présente invention concerne un dispositif de présentation à un sujet d'une image fusionnée (93) perçue par ce sujet à différentes distances, comportant deux ouvertures pupillaires (10, 11) devant lesquelles les yeux (8, 9) du sujet sont destinés à être positionnés et, derrière chaque ouverture pupillaire, une lentille frontale (12, 13), fixe par rapport au dispositif, présentant un axe optique (30, 31 ), ainsi qu'un système optique (4, 5) d'imagerie d'un objet de test (19, 20) comprenant un ou plusieurs éléments optiques dont au moins un support de présentation (17, 18) de l'objet de test. Selon l'invention, chaque système optique d'imagerie d'un objet de test comprend un élément optique monté mobile (14, 15) suivant une trajectoire ayant au moins une portion utile présentant, en tout point, une direction de déplacement comportant d'une part, une première composante suivant la direction de la portion éventuellement propagée de l'axe optique de la lentille frontale incidente sur l'élément optique monté mobile et d'autre part, une deuxième composante transversale à la première composante.
Abstract:
A method for determining a position variation of an eyewear equipment worn by a wearer, the method comprising: - obtaining reference data representing a reference position of an eyewear equipment worn by the wearer, the eyewear equipment comprising at least one ophthalmic lens and a frame on which the at least one ophthalmic lens is mounted; - determining at least one reference position parameter indicative of a reference position of the eyewear equipment on the face of the wearer based on the reference data; - obtaining current data representing a current position of the eyewear equipment worn by the wearer; - determining at least one current position parameter indicative of a current position of the eyewear equipment in front of the eyes of the wearer based on the current data; - comparing the reference and current positions parameters so as to determine a position variation of the eyewear equipment worn by the wearer.
Abstract:
The invention relates to an optical device comprising: an active programmable lens (20) having an adjustable optical power depending on a prescription of a wearer and being relative to a vision distance and/or direction of an eye of the wearer; a vision sensor (22) adapted to measure vision data relating to the vision distance and/or direction of the eye; and an optical power controller (30) comprising: a memory (32) storing computer executable instructions and adapted to store measured vision data and two predetermined optical power states corresponding to an optical power relative to a range of vision distance and/or direction of the eye; and a processor (34) for executing the stored computer executable instructions, wherein the computer executable instructions comprise instructions for adjusting the adjustable optical power between the predetermined optical power states with a resolution smaller than or equal to 0.25D when the vision data passes from one range of vision distance and/or direction to another.
Abstract:
Method for determining an eye parameter of a user of a display device, the eye parameter relating to a dioptric parameter of an ophthalmic lens to be provided to the user, the method comprising: -a display device providing step, during which a binocular display device is provided to the user, -an image display step, during which an image is displayed to the user when using the display device, -a display parameter modifying step, during which at least one parameter of the display device is modified so as to modify the virtual display distance of the perceived image, wherein the display parameter modifying step is repeated until image subjective quality of the perceived image is perceived by the user as optimal, and - an eye parameter determining step during which an eye parameter is determined based on the parameter of the display device.
Abstract:
Method for determining an eye parameter of a user of a display device, the eye parameter relating to a dioptric parameter of an ophthalmic lens to be provided to the user, the method comprising: - a display device providing step, during which a binocular display device is provided to the user, - an image display step, during which an image is displayed to the user when using the display device, - a display parameter modifying step, during which at least one parameter of the display device is modified so as to modify the virtual display distance of the perceived image, wherein the display parameter modifying step is repeated until image subjective quality of the perceived image is perceived by the user as optimal, and - an eye parameter determining step during which an eye parameter is determined based on the parameter of the display device.