A portable visual acuity screening instrument and an optical path structure thereof

Abstract

The present invention relates to the field of medical detection equipment and visual acuity screening instrument, in particular to a portable visual acuity screening instrument and an optical path structure thereof. The visual acuity screening instrument comprises a circuit system and an optical path structure. The circuit system is a dual-processor structure, which comprises an ARM processor, anFPGA, an SDRAM, an ultrasonic ranging circuit, a temperature detection circuit, an ambient light detection circuit, a wireless charging circuit and the like. The optical structure includes near-infrared light source, a collimator lens, a CCD image sensor, a HS sensor, a high-pass filter and so on. The instrument of the present invention can be used for adults, Fast, accurate and comprehensive visual screening and analysis for infants and children, patients with special diseases and other groups can be used to detect spherical lens power, cylindrical lens power, cylindrical lens angle, pupil size, pupil distance, refractive abnormality and fixation direction, which is suitable for hospitals, physical examination centers, schools, optical shops and other institutions.

Description

technical field [0001] The invention relates to the fields of medical testing equipment and vision screening instruments, in particular to a portable vision screening instrument, its optical path structure and its application in medical testing. Background technique [0002] At present, the vision screening instrument (refractor) used in hospital ophthalmology and glasses industry is mainly desktop optometry equipment. The subjects of optometry are mainly adults or children who have reached a certain age and can actively cooperate. to observe. Desktop optometry equipment can be divided into subjective optometry and objective optometry according to their different optometry principles. Subjective optometry requires feedback from the testee to make the test results more accurate; while objective optometry does not require Feedback from the testee avoids human error. However, both subjective optometry and objective optometry require the behavior of the subject to cooperate. I...

AI Technical Summary

Problems solved by technology

[0005] However, the above two portable vision screening instruments also have their own advantages and disadvantages: the portable optometry instrument using Hartmann-Shark technology is generally called a monocular vision screening instrument. Its advantage is accurate measurement, but there are relatively few measurement items and can only Measuring spherical mirror (myopia, hyperopia), cylindrical mirror (astigmatism) and axial position (astigmatism angle), and can only be measured with one eye; portable vision screening instrument using camera technology, generally called binocular vision screening instrument, which can simultaneously Measure the spherical lens (myopia, hyperopia), cylinder lens (astigmatism) and axial position (astigmatism angle) of the two eyes, and analyze the pupil size, pupillary distance, fixation angle and other results through image processing, and At the same time, the images of the eyes are taken. Compared with the Hartmann-Shark technology, its analysis content is much richer, but its biggest problem is that the test results are low in accuracy, poor in repeatability, and cannot analyze high-order aberrations.

However, due to the great difference in the detection principles of the above two portable vision screening instruments, it is difficult to use them in combination. Therefore, no portable vision screening equipment made by combining the above technologies has been seen so far.

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