Optical system and optometry method of computer optometer

Abstract

The invention discloses an optical system and an optometry method of a computer optometer, and belongs to the technical field of visual optical imaging measurement. A light source is utilized to emit parallel collimating rays; the collimating rays are processed through a ring-shaped diaphragm so as to form a collimating light ring; the collimating light ring is projected onto eyes of people, and then is reflected by the eyes of people to form circular reflection images; the ring thickness of each reflection image is detected in different distances relative to the eyes of people, the imaging position corresponding to the narrowest ring thickness is determined, and the distance between the imaging position and the eyes of people is converted to the diopter of the eyes of people; the system implementing the method comprises a collimating light source, a focusing lenses group, the ring-shaped diaphragm, a semi-transmissive semi-reflective mirror group and an image collector; the ring-shaped diaphragm is positioned in the front of the collimating light source; the semi-transmissive semi-reflective mirror group is used for refracting the light ring that is transmitted through the ring-shaped diaphragm to the eyes of people, and refracting the reflection images of the eyes of people onto the focusing lenses group; and the image collector is used for collecting the reflection images from the focusing lenses group. The optical system and the optometry method of the computer optometer are used for testing the ametropia of the eyes of people, enabling the eyes of people to be in a natural relaxed state all the time during the testing process, and improving the testing accuracy.

Description

technical field [0001] The invention relates to the technical field of optometry imaging measurement, in particular to an optical system and an optometry method of a computer optometry instrument. Background technique [0002] As we all know, the incidence of myopia among Chinese students remains high, and China is also the "second largest country for myopia" after Japan. In order to prevent the occurrence of myopia and effectively measure the degree of refraction of myopia, optometry technology has become an important branch of the development of optometry technology in line with the needs of the times. Among them, whether the degree of refractive error of the human eye can be accurately measured is the key to preparing corrective glasses for patients, and it has also become one of the hot issues in the current optometry technology research. [0003] Optometry is to check the focus of light after it enters the eyeball. It takes the emmetropic eye state as the standard to m...

AI Technical Summary

Problems solved by technology

Since the appearance of the computer refractometer in 1759, it has been continuously innovating in recent years. However, with the widespread popularization of the computer refractometer and the rapid development of optometry technology, some problems have appeared in the detection of the computer refractometer. The standard and closed windows are likely to cause tension in the subject, thereby stimulating the human eye to continuously adjust during measurement. The vision measured in this non-relaxed state is often inaccurate, which may easily cause misjudgment of the vision degree and affect Glasses or eye parameters check

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