Multifunctional visual contrast sensitivity instrument

Abstract

The invention relates to a multifunctional visual contrast sensitivity instrument for clinically detecting the visual contrast sensitivity of human eyes and particularly suiting for estimating and detecting the visual quality before or after an ophthalmic refractive surgery and a cataract surgery. The invention provides the following technical scheme that the multifunctional visual contrast sensitivity instrument comprises a data processing and controlling system, a box body, an eyepiece and a monitor which is arranged in the box body and corresponds to the eyepiece, the box body is an obscure camera, the data processing and controlling system comprises a detected virtual target database, a detected virtual target database management unit, a man-computer operation interface and a display, the monitor and the data processing and controlling system form signal transmission by a monitor-driving unit, the monitor is used for displaying a detected visual target, and the display simultaneously displays an observation visual target with the same pattern as the detected visual target. By the technical scheme, the invention provides the multifunctional visual contrast sensitivity instrument which avoids the interference of an environmental light source, has short detection time and is convenient for medical stuff to observe and operate.

Description

technical field [0001] The invention relates to a multifunctional visual contrast sensitivity instrument for clinically detecting the visual contrast sensitivity of human eyes, and is especially suitable for visual quality evaluation and detection before and after ophthalmic refractive surgery and cataract surgery. Background technique [0002] Contrast sensitivity function (CSF) is a physical quantity that measures the minimum black-and-white contrast on the surface of an object required for the visual system to recognize objects of different sizes (spatial frequencies). It is a new quantitative inspection method for shape perception functions. This kind of inspection was first used by Schade in 1956. The sinusoidal grid was displayed by an oscilloscope. After a lot of research, Campbell and Green (1965) proposed a relatively complete concept of contrast sensitivity. In 1978, Arden first used different frequencies, Gratings with different contrasts A set of printed grating ...

AI Technical Summary

Problems solved by technology

[0005] At present, most of the instruments used in domestic hospitals come from the CSV-1000 type of Vecter Vision Company in the United States. It is currently recognized as the gold standard contrast sensitivity instrument. Its light box design is easily affected by the detection distance and ambient light; the sinusoidal grating is printed on the light box. On the panel, the number is small and unchanged, and it is easy to be recorded, which affects the accuracy of the test; the test results need to draw a report manually, and to get the test data, you have to consult the information, which is very cumbersome, heavy workload, low efficiency, and the test The binocular time is about half an hour

[0006] There is also an instrument from the U.S. Stereo Optical Company, which uses inserted slides to project on the screen to display the sinusoidal grating optotype in the case, and uses the operating handle connected to the case to control the change of the sight, which is vulnerable to the slide. Deformation, mildew, dirt pollution and other factors cause inaccurate test results

Restricted by the number of slides, there are few changes and the response speed is slow

At the same time, the English operation interface brings inconvenience to the use

Images