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Device for detecting an accommodation inaccuracy

A technology for adjusting errors and detecting graphics, which is applied in the direction of eye testing equipment, applications, medical science, etc., and can solve expensive and other problems

Inactive Publication Date: 2013-07-17
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It is also known to use ophthalmoscopes in near vision, which are less expensive than automatic refractometers, but are still relatively expensive and require a highly trained professional user and relatively long hours of operation

Method used

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  • Device for detecting an accommodation inaccuracy
  • Device for detecting an accommodation inaccuracy
  • Device for detecting an accommodation inaccuracy

Examples

Experimental program
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Effect test

Embodiment Construction

[0052] The method for detecting an adjustment error of an individual according to the invention comprises:

[0053] providing at least one eye of the individual with not only vision correction, if desired, but also a spherocylindrical lens exhibiting a non-zero prescribed cylinder Cyl with an absolute value of 0.50 diopters to 2.00 diopters;

[0054] Fixing said eyes on a first fixed target in near vision;

[0055] displaying to the eye a detection pattern in near vision for a period of 20 milliseconds to 300 milliseconds, the detection pattern having two predominant orthogonals coincident with the axis and the cross-axis of the lens direction; and

[0056] An accommodation error is detected if the individual perceives that one of the two dominant directions has a different sharpness than the other.

[0057] Said time period is less than 300 milliseconds, so as to be shorter than the time required to trigger the conditioning phenomenon. Therefore, the regulation does not ha...

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Abstract

The method involves equipping one of eyes of individual with sphero-cylindrical spectacle lens presenting a non-zero prescription cylinder whose absolute value ranges between 0.50 and 2.00 dioptres. A target (7A) is fixed in a near vision by the eye. A detection pattern e.g. Maltese cross, comprising privileged orthogonal directions coinciding with an axis and counter axis of the lens is presented in the near vision during a period of time ranging between 20 and 300 milliseconds. Accommodation inaccuracy is detected if the individual receives one of the directions with different sharpness. An independent claim is also included for device for detecting an accommodation inaccuracy of an individual, comprising a tachistoscope.

Description

technical field [0001] The invention relates to a method and a device for detecting accommodation inaccuracy. Background technique [0002] The accommodation mechanism is the process by which the eye focuses on an object by changing the efficacy of its lens and / or by reducing the diameter of its pupil. There are two types of adjustment errors. [0003] Accommodative hysteresis is the negative difference between the eye's accommodative response and the refractive stimulus that caused the accommodation. [0004] Accommodative lead is the positive difference between the eye's accommodative response and the refractive stimulus that caused the accommodation. [0005] There are known methods and devices for detecting adjustment errors. [0006] Such detection can be performed by an autorefractor such as "Shin Nippon SRW 5000", "Canon R-1" or "Grand Seiko WAM 5500" in open field near vision. These electronic devices are complex, bulky and expensive, and they require a knowledge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/09
CPCA61B3/09
Inventor B·德罗比G·吉罗德
Owner ESSILOR INT CIE GEN DOPTIQUE