Computer optometry unit

Abstract

The invention discloses a computer optometry unit. The computer optometry unit comprises a fogging light path and a focusing light path, and is characterized in that the focusing light path comprises a laser, a first light source lens, a second light source lens, a PBS, a first spectroscope, a second spectroscope, an objective lens, a first focusing lens, a second focusing lens, a telecentric diaphragm, a cornea objective lens and a first detector. The second spectroscope, the PBS, the first light source lens, the second light source lens and the laser are located on a first optical axis and are sequentially arranged on the same optical axis, the first spectroscope, the objective lens and the second spectroscope are located on a second optical axis and are sequentially arranged on the same optical axis, and the first spectroscope, the telecentric diaphragm, the cornea objective lens and the first detector are located on a third optical axis and are sequentially arranged on the same optical axis. The first focusing lens and the second focusing lens are symmetrically arranged along the third optical axis and are located between the first spectroscope and the telecentric diaphragm. The unit has the advantages that whether the vertex of the cornea is focused or not is judged simply, visually and accurately, the focusing accuracy of the vertex of the cornea is improved, and high-precision and high-repeatability measurement of human eyes is realized.

Description

technical field [0001] The invention relates to optometry equipment for checking human eyes, in particular to a computer optometry instrument. Background technique [0002] There are mainly two kinds of optometry methods for human eyes, subjective optometry and objective optometry. Subjective optometry is an inspection method that relies on the subjective visual ability of the inspected to determine the nature and abnormality of the refractive state. The commonly used method is to put the lens in front of the patient for corrected visual acuity examination when the pupil is kept in a natural state (without dilating), and determine the nature of the refractive error and the appropriate corrective lens power according to the patient's subjective vision. Also known as the insert method or the obvious optometry method, but it has the problems of not being fully automatic and taking a long time to measure. The objective optometry method is to rely on optometrists or ophthalmolo...

AI Technical Summary

Problems solved by technology

However, this method is susceptible to the subjective influence of optometrists, and it is difficult to achieve high precision and high repeatability, which will eventually affect the accuracy of measurement data

In addition, most of the current computer refractometers can only calculate the low-order aberrations of the human eye. The low-order aberrations are common refractive errors such as myopia, hyperopia, and regular astigmatism. Aberrations (higher-order aberrations are caused by irregular astigmatism, spherical aberration, coma, etc.) but powerless, resulting in inaccurate and thorough inspection of human eyes

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