Corneal curvature calculation method for computerized refractometer

Abstract

The invention relates to a computerized refractometer capable of automatically compensating the corneal curvature measuring accuracy and a corneal curvature calculation method. The traditional refractometer can not accurately measure the human eye corneal curvature radius. The computerized refractometer capable of automatically compensating the corneal curvature measuring accuracy comprises a main imaging device, wherein the main imaging device consists of an eyepieces lens, a diaphragm, a first imaging objective and an image sensor which are linearly arranged. The computerized refractometer capable of automatically compensating the corneal curvature measuring accuracy is characterized by also comprising two groups of collimation illumination devices, wherein each collimation illumination device consists of a first light emitting diode (LED) lamp, a pinhole plate and a collimating mirror, and the collimation illumination devices and the main imaging device form two paths of collimation light path systems. The computerized refractometer also comprises two groups of annular light sources, wherein the two groups of annular light sources and the main imaging device form two paths of non-collimation light path systems. The computerized refractometer disclosed by the invention consists of a corneal curvature measuring system and an eye diopter measuring system, the corneal curvature can be accurately measured, and the eye diopter can be accurately measured.

Description

technical field [0001] The invention relates to a computer optometry instrument capable of automatically compensating the measurement accuracy of corneal curvature and a calculation method for corneal curvature. Background technique [0002] The corneal curvature value is used as the prescription criterion for wearing contact lenses for the tested eyes. If a person wears contact lenses based on the wrong corneal curvature value, it will cause the contact lens to fall off, the eyes have a foreign body sensation, or the cornea is scratched and inflamed . Therefore, it is very meaningful to accurately measure the corneal curvature value of the tested eye. The design principle and precision of existing domestic refractometers with corneal curvature function cannot meet the requirements of the national standard and cannot meet the market demand. In corneal curvature measurement, the most accurate image of corneal reflected light is formed when the tested eye is just at the foca...

AI Technical Summary

Problems solved by technology

When the distance between the measured eye and the optical component changes, the radius of curvature of the cornea also changes, so the usual refractometer cannot accurately measure the radius of curvature of the human eye

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