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Eyesight exam method and device

A vision test and examiner's technology, applied in medical science, eye testing equipment, diagnosis, etc., can solve problems such as the inability to ensure that the brightness of the display is half brightness and affect the accuracy of test results

Inactive Publication Date: 2009-03-11
SHENZHEN DIMETEK DIGITAL MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the non-linearity of the brightness of various graphics displays and the inconsistency of their brightness curves, the brightness of each display cannot be guaranteed to be at half brightness when the video output is at half brightness level; and the brightness characteristics of various graphics displays vary over time change, so as to affect the accuracy of the test results
Although the ability to generate graphics is greatly enhanced, this method of using a computer monitor still suffers from the shortcomings of traditional inspection methods

Method used

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  • Eyesight exam method and device
  • Eyesight exam method and device
  • Eyesight exam method and device

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Embodiment Construction

[0036] The visual inspection device includes the following parts: object graphics display part 1, intelligent control part 2, control input and output part 3, and subject information input part, see figure 1 . Wherein, the intelligent control part 2 is connected with input devices such as keyboard and mouse through a wired or wireless connection, and accepts the control of the control input and output part 3; The graphic information is sent to the object graphic display part 1; the intelligent control part 2 is connected with input devices such as mouse 4 or video camera 5 through wired or wireless connection, and accepts the information provided by the examinee information input part.

[0037] The present invention will be described in detail below in conjunction with the working principle of each part.

[0038] (1), the graphic display part of the target adopts a high-resolution (1024x768 or higher such as 2560x1600) CRT / LCD / LED / PLASMA display screen / projector, or a high-re...

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Abstract

A method for testing vision by the user itself includes such steps as generating a background on a display medium by 'the optimal-resolution array method with the bright-dark intervals', displaying object graphics with same brightness and variable contrast, moving the position of object graphics by 'random position algrithm', and judging the position of object graphics by the user according to 'step-by-step approximate method'. Its system is also disclosed.

Description

technical field [0001] The invention discloses a visual inspection method and device. Background technique [0002] Visual acuity is defined as the ability of the eye to distinguish the smallest object pattern. The unit of measurement of this ability can be the angle of view (view angle), that is, the angle between the two ends of the target figure and the intersection of the eye lens; or the spatial frequency (spatial frequency), that is, the number of light and shade changes contained in the target figure per unit angle. number of cycles. Angle of view and spatial frequency are reciprocal to each other; the smaller the angle of view that the examinee can identify, or the higher the spatial frequency, the better the vision. At present, the traditional visual inspection methods all use logarithmic visual acuity charts (such as international standard visual acuity charts), that is, under the condition of uniform white background light, the target graphics are displayed at a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/032
Inventor 曹阳
Owner SHENZHEN DIMETEK DIGITAL MEDICAL TECH