Method for altering the visual performance of a subject, method for measuring the spherical refraction correction need of a subject and optical system for implementing these methods

An optical system and subject technology, applied in the direction of retinal mirror, comprehensive refractometer, eye testing equipment, etc., to achieve the effect of reducing the number of tests and high precision

Active Publication Date: 2020-09-25
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] All of these methods of obfuscation and / or deambiguation have disadvantages with respect to the subjects doing the testing but also with respect to the quality of the results depending on the operator using these methods

Method used

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  • Method for altering the visual performance of a subject, method for measuring the spherical refraction correction need of a subject and optical system for implementing these methods
  • Method for altering the visual performance of a subject, method for measuring the spherical refraction correction need of a subject and optical system for implementing these methods
  • Method for altering the visual performance of a subject, method for measuring the spherical refraction correction need of a subject and optical system for implementing these methods

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no. 1 example

[0369] In the first embodiment:

[0370] - When measured visual acuity is less than 2 / 10, set an intermediate visual acuity target of 4 / 10, corresponding to the first step towards the final visual acuity target. The corresponding degree of defocus is determined and applied using the previously mentioned formula Eq. Display optometry font size corresponding to visual acuity 4 / 10;

[0371] - When the measured visual acuity is greater than 2 / 10 and less than 4 / 10, an intermediate visual acuity target of 5 / 10 is set, corresponding to the first step towards the final visual acuity target. The corresponding degree of defocus is determined and applied using the previously mentioned formula Eq. Display optometry font size corresponding to visual acuity 5 / 10;

[0372] - When the measured visual acuity is greater than 4 / 10 and less than 8 / 10, the visual acuity target is referred to as the final visual acuity target. The corresponding degree of defocus is determined and applied using...

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Abstract

The invention relates to a method for altering the visual performance of a subject using an optical system arranged in front of at least one eye of the subject, and comprising: b) determining an optotype; c) displaying the optotype to the subject in such a way that it is visible by the subject through said optical system; d) assessing the visual performance of the subject viewing the optotype through the optical system; and e) adding a positive or negative altering value of spherical optical power to the optical system. According to the invention, the method comprises, before step b): a) choosing a target value of visual performance; and in that, at step b), said optotype has a size which is determined depending on said target value of visual performance; at step e), said altering value ofspherical optical power is determined depending on said target value of visual performance.

Description

technical field [0001] The present invention relates to a method for altering the visual performance of a subject, in particular for assessing the visual acuity of the subject, more particularly where it is desired to blur and / or eliminate The level of optical correction of the subject's vision was determined during the blur test. Background technique [0002] When assessing the refraction of each eye in a subjective test involving reading trials involving refraction fonts and visual targets, it is important to control the accommodation of the eyes in order to avoid false assessments of the subject's subjective refraction. Focus on the target and answer the test correctly. [0003] A common method of controlled accommodation is the so-called blurring or fogging method (these are synonyms), in which during the initial blurring phase the eye is made nearsighted while wearing fogging lenses during the test. Then, in the next blur removal phase, corrective lenses are used sequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/028A61B3/032
CPCA61B3/0285A61B3/032A61B3/04A61B3/103A61B3/0041A61B3/0025A61B3/0033
Inventor A·朗佝M·文森特H·斯塔里恩凯维奇
Owner ESSILOR INT CIE GEN DOPTIQUE
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