Multi-functional prism changing instrument convenient to measure

Abstract

The invention relates to the technical field of sight measuring equipment, and provides a multi-functional prism changing instrument convenient to measure. The multi-functional prism changing instrument comprises a trial frame, wherein the trial frame comprises a cylindrical lens frame, a connecting part and auxiliary rods; first grooves and second grooves are separately formed in the front side surface of the lens frame from the front to the rear; three gear grooves which are distributed in a ladder-like manner are formed in the front side wall of each first groove backwards; a gear set whichis in mutual meshing is mounted in each gear groove set; a first prism, a second prism and a cylinder lens are sequentially mounted in each second groove in a cooperation manner from inwards to outwards; and gear grooves are formed in the cylindrical housings of the first prism, the second prism and the cylinder lens. Through the adoption of the multi-functional prism changing instrument convenient to measure disclosed by the invention, the problems that in the prior art, a trial frame is single in functions, cannot perform synchronous detection on shortsightedness, astigmatism and strabismuscapacity, a lens needs to be repeatedly replaced, and the detection efficiency is influenced, are solved.

Description

technical field [0001] The invention relates to the technical field of visual acuity measuring equipment, in particular to a multifunctional varistor that is convenient for measurement. Background technique [0002] At present, low vision patients are a large group in our country. How to make low vision patients obtain the best vision is a problem worthy of everyone's attention. For low vision patients, the examination of astigmatism axis is a more critical issue. At present, there are three methods for axial astigmatism examination, one is retinoscopy, the other is slit film, and the third is astigmatism table. Astigmatism is useless for people with low vision; retinoscopy will be restricted by many factors, and there are very few optometrists who can retinoscopy in modern times, and sometimes the error is large, so it is not commonly used. [0003] Due to the high price and cost of the comprehensive optometry instrument, and it is not easy to carry and use, in many small...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a multifunctional varistor that is convenient for measurement, which solves the problem that the trial frame of the prior art has a relatively single function and cannot simultaneously detect myopia, astigmatism and strabismus at the same time, and requires constant Change the lens, the problem that affects the detection efficiency

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