Dispersion speckle refractometer and method for testing myopic, hyperopic and astigmatic degrees

Abstract

The invention discloses a dispersion speckle refractometer and a method for testing myopic, hyperopic and astigmatic degrees. The dispersion speckle refractometer comprises a laser, a half-reflecting half-transparent prism, a two-dimensional rotary reflecting mirror capable of rotating around a horizontal rotating shaft and a vertical rotating shaft, and a diffuser screen; the half-reflecting half-transparent prism and the diffuser screen are positioned in a laser transmitting direction of the laser along an optical path, and the two-dimensional rotary reflecting mirror is positioned in a reflected light transmitting direction of the half-reflecting half-transparent prism; a circular pupil sheet is arranged between the diffuser screen and an eyeball of a human body to be tested; and a light-transmitting diameter of the pupil sheet is 4 + / - 0.5mm, and a distance from the pupil sheet to a cornea is smaller than 6mm. The invention has the advantages that: the cost is low, and the operability and the practicability are good; the precision of testing parameters such as the myopic degree, the hyperopic degree, the astigmatic degree and the like is quite reliable; and inferential analysis on a patient glasses situation is facilitated.

Description

technical field [0001] The invention belongs to the technical field of ophthalmology and optometry, and specifically refers to a speckle refractometer, which is a method for testing the degree of myopia, hyperopia and astigmatism of a human body by using the speckle refractometer. Background technique [0002] We know that when distant objects are imaged by non-emmetropic eyes (such as astigmatism or myopia), their focal point will deviate from the retinal position, so a blurred defocus circle (blur-circle) will be produced on the retina. According to this, people have Recognizing that refractive error will lead to changes in the shape of diffuse spots in the fundus, and deriving the calculation formula from the simplified eye [see Obstfeld H. Optics in vision[M].Vol 1st ed. London: Butterworth &Co Ltd ,1978. 58-99. ]. In the 1990s, Chinese scholars also proposed the idea of ​​using diffuse spots for optometry [see Li Xinru, Huang Xueping, Tao Yuhua, etc. [J]. Experimental ...

AI Technical Summary

Problems solved by technology

However, due to the limited precision of the simplified eye model used, and the need to measure a large number of individual parameters for the complex eye model, the traditional research is still in the research stage and cannot meet the accuracy requirements of optometry applications.

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