Abstract:
The invention relates to an optometry device (100) for testing an individual's eye (1), comprising a refraction test unit (10) having a vision correction optical system (13) for providing different vision correction power values; and a display unit (20) comprising a control unit (28, 29) controlling a projection optical system (20A, 20B) adapted to produce from a scene picture and from a visual test picture including a functional zone, respectively: - along a scene optical path of said projection optical system a scene image (SCN) at a scene distance (D2) from the individual's eye; and - along a visual test optical path of the projection optical system, a visual test image (OPT) at a visual test distance (D1) from the individual's eye smaller than or equal to said scene distance of projection, said visual test image being superimposed at least partially with said scene image. According to the invention, said control unit is configured to define in the scene picture at least one scene zone implying transparency (50) for the corresponding scene image and in the superimposition area between the visual test image and the scene image, allowing the individual's eye to observe the functional zone of the visual test image without contrast decrease, at the visual test distance.
Abstract:
L'invention concerne un procédé de détermination d'un filtre pour une lentille ophtalmique destinée à être placée devant l'œil d'un porteur, ledit filtre étant apte à améliorer ou à maintenir le confort visuel et/ou les performances visuelles dudit porteur, Selon l'invention, ce procédé comporte : a) une étape de détermination d'une grandeur représentative d'une sensibilité dynamique de l'œil ou des deux yeux du porteur à une variation d'un flux lumineux, et b) une étape de détermination d'au moins une caractéristique optique dudit filtre en fonction de la grandeur représentative déterminée.
Abstract:
L'invention concerne un procédé de détermination d'un filtre pour une lentille ophtalmique destinée à être placée devant l'œil d'un porteur, ledit filtre étant apte à améliorer ou à maintenir le confort visuel et/ou les performances visuelles dudit porteur. Selon l'invention, le procédé de détermination comporte : - une étape de mesure d'une grandeur représentative d'une sensibilité de l'œil ou des deux yeux du porteur à un flux lumineux caractéristique, et - une étape de détermination d'au moins une caractéristique optique dudit filtre en fonction de la grandeur représentative mesurée.
Abstract:
The invention relates to a method for inducing a controlled variation of accommodation in an eye of a subject, using an optical system arranged in front of at least one eye of the subject and comprising the following steps: a) displaying an environmental scene (1), b) displaying, in this environmental scene (1) displayed in step a), a target (2) visible by the subject through said optical system, said target (2) being displayed in such a way that it is perceived by the subject as moving away from said subject or moving towards said subject within said environmental scene, c) having the subject observe said moving target (2) displayed in step b).
Abstract:
In the method according to the invention, an optical system (2) is switched from a first to a second refractive power states, to provide a first, and then a second refraction correction to an eye (4) of a subject, said switching being carried on without interrupting a light beam (6) coming from a target object (7) and transmitted by the optical system to the eye of the subject. Said 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. The invention concerns also an associated instrument (1).
Abstract:
The invention relates to an optometry device (100) for testing an individual's eye (1), comprising a refraction test unit (10) having a vision correction optical system (13) for providing different vision correction power values; and a display unit (20) comprising a control unit (28, 29) controlling a projection optical system (20A, 20B) adapted to produce from a scene picture and from a visual test picture including a functional zone, respectively: - along a scene optical path of said projection optical system a scene image (SCN) at a scene distance (D2) from the individual's eye; and - along a visual test optical path of the projection optical system, a visual test image (OPT) at a visual test distance (D1) from the individual's eye smaller than or equal to said scene distance of projection, said visual test image being superimposed at least partially with said scene image. According to the invention, said control unit is configured to define in the scene picture at least one scene zone implying transparency (50) for the corresponding scene image and in the superimposition area between the visual test image and the scene image, allowing the individual's eye to observe the functional zone of the visual test image without contrast decrease, at the visual test distance.
Abstract:
The invention relates to a system for determining a rounded value of an optical feature of at least an ophthalmic lens adapted to provide a dioptric correction for improving the vision of a subject, said system comprising one or more processors programmed to implement the steps of: a) determining (400) a first test value of the optical feature and a first variation increment of the optical feature, b) performing (500) a first trial of said subjective test wherein two first different optical situations are determined based on at least the first test value, c) determining (600) a second test value of the optical feature based on the first test value, on the first variation increment and on the result of the first trial, d) performing (700) a second trial of said subjective test wherein two second different optical situations are determined based on at least the second test value, e) determining (800) an intermediary value of the optical feature based on the result of the first trial and on the result of the second trial, f) determining (900) said rounded value of the optical feature by rounding said intermediary value to a reference value, said rounding modifying the dioptric correction of said ophthalmic lens by less than a predetermined basic dioptric value.
Abstract:
The invention relates to a system for determining a value of a magnitude associated with a subjective value of an optical feature of at least a corrective lens adapted to an eye of a subject, by implementing a subjective test where the subject is asked to describe his visual performance in a plurality of real optical conditions by choosing one descriptive answer among a set of possible descriptive answers, comprising a computer with one or more memory and one or more processor, wherein: - an initial model giving the probability of each descriptive answer of the set of descriptive answers for each theoretical optical condition of a plurality of theoretical optical conditions is stored in one of said one or more memory of said computer, - said one or more processor of said computer is programmed to: a) collect (500) the results of said subjective test, performed by asking the subject to describe his visual performance in each real optical condition of said plurality of real optical conditions by choosing, for each real optical condition, one descriptive answer among said set of possible descriptive answers, said results comprising each descriptive answer chosen and the corresponding real optical condition, b) determine (800, 900) the value of said magnitude by taking into account said initial model and each descriptive answer collected.
Abstract:
The invention concerns a couple of test images, for a binocular refraction method, that comprises: - a first test image (21) to be provided to a first eye of a subject, comprising a central image (21c) surrounded by a first peripheral image (21p), this central image comprising at least one optotype (21o); and - a second test image (22) to be provided to a second eye of the subject, comprising a central image (22c) surrounded by a second peripheral image (22p) substantially identical to the first peripheral image, this central image being deprived of optotypes, or comprising only optotypes (22o) with a low contrast or sharpness level. The invention concerns also an associated binocular refraction method and refraction instrument, and an associated computer program.
Abstract:
The invention relates to a method for determining a value of a global sensitivity parameter (Sgsph, Sgcyl, Sgaxis, Sgasr, Sg J0, SgJ45, Soverall) of a subject, said global sensitivity parameter being relative to the sensitivity of said subject to a variation of at least a dioptric optical feature of at least an ophthalmic lens placed in front of at least one eye of said subject, comprising the following steps: a) determining (100) a single value of at least a first sensitivity parameter of said subject, relative to the sensitivity of the subject to a variation of a first dioptric optical feature of at least a first ophthalmic lens, b) determining (110) a single value of at least a second sensitivity parameter of said subject, relative to the sensitivity of the subject to a variation of a second dioptric optical feature of at least a second ophthalmic lens, each of the first and second sensitivity parameters being respectively related to the smallest variation of said first and second dioptric optical feature that may be perceived by the subject, c) using computing means to determine (120) said value of the global sensitivity parameter taking into account a combination of said single values of the first and second sensitivity parameters. It also related to methods using this value and a system for performing this method.