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Method and apparatus for visual acuity testing

A technology of vision testing and testing graphics, which is applied in the direction of eye testing equipment, applications, medical science, etc., and can solve problems such as variation of vision testing instruments

Active Publication Date: 2022-06-07
大卫埃文斯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the need for standardization has been recognized for some time, to date, brightness standards have not been adopted by practicing ophthalmologists, primarily because most ophthalmologists use the same type of vision testing instrument, which due to the similarity of the equipment, does not Test instruments inherently produce small variations
Furthermore, the required accuracy of vision testing is not such that differences in luminance levels between exam lanes or between eye clinics will create problems for recording visual performance

Method used

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  • Method and apparatus for visual acuity testing
  • Method and apparatus for visual acuity testing
  • Method and apparatus for visual acuity testing

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Embodiment Construction

[0028] The present invention is based on the observation that computer displays not only vary in brightness from display to display, but also change when the display is used for other tasks, as the operator can adjust the display brightness to suit his or her needs . Thus, a mechanism for adjusting the brightness to a desired range at the beginning of an eye examination is required to ensure that the examination is carried out under standardized conditions.

[0029] reference now figure 1 , which illustrates a display according to one aspect of the present invention. The display 20 is connected to a controller, which is typically a conventional data processing system 22 . The controller causes the display 20 to display a conventional vision chart in the chart display area 23 . Removable sensors 21 are positioned on display 20 in areas not used for vision charts. Sensor 21 measures the average intensity of light exiting display 20 and communicates this measurement to data p...

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Abstract

A vision testing system and a method of operating a data processing system for displaying eye test graphics to a patient on a computer display during an eye examination are disclosed. The method includes causing the data processing system to display the eye test pattern in a graph region of a computer display controlled by the data processing system and characterized by brightness in regions where the eye test pattern is not displayed. A display brightness sensor is used to measure light intensity leaving the computer display in a sensor area outside the chart area. The brightness of the computer display is adjusted based on the measured light intensity to provide a light level within a predetermined range of light levels. The data processing system may receive the measured intensity and adjust the display lighting.

Description

Background technique [0001] Visual performance standards in the U.S. and around the world rely on tests of visual acuity, which rely on presenting patients with a series of black letters on a white background. Research has shown that test results can vary widely based on the type of vision test used and the conditions in which the test was conducted. [0002] To ensure standardization, several recommended parameters for visual acuity testing have been established, including letter height, letter width, letter spacing, letter type, scoring process, test distance, and test brightness. Generally, clinicians have employed these test parameters. However, standardization of test lighting has not been adopted, and this is an area of ​​great need. The data show that the results of the sensitivity test vary widely depending on the test light level. It is recognized that higher light levels produce significantly better visual results than lower light levels, and older patients are mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/032
CPCA61B3/032A61B3/0041A61B3/0025A61B3/0008
Inventor 大卫·埃文斯
Owner 大卫埃文斯