Skiascope

Abstract

The invention discloses a skiascope which is provided with an illuminating image-forming system comprising an illuminating light source, a projecting mirror and a semi-transparent mirror; the illuminating light source, the projecting mirror and the semi-transparent mirror are sequentially arranged in the light direction of an illuminating optical axis of a beam and are arranged on the same optical axis; the reflecting plane of the semi-transparent mirror and the illuminating optical axis form an angle of 45 degrees; a condenser lens column and a skiascopy diaphragm are sequentially arranged on the illuminating optical axis between the illuminating light source and the projecting mirror; the optical axis of the condenser lens column and the illuminating optical axis coincide; the skiascopy diaphragm is arranged on the focal surface of the projecting mirror; a plane of the skiascopy diaphragm is vertical to the illuminating optical axis and can rotate along the illuminating optical axis; the projecting mirror can move relative to the axial direction of the skiascopy diaphragm. The skiascope can enable the light energy use ratio to be high after the condenser lens column is added on the illuminating light source; the image formed by the strip-shaped light or point-shaped light of the skiascopy diaphragm by means of the projecting mirror, is clear and even in boundary; the skiascope of the illuminating imaging system is compact in structure; the color vision can be better if a colored light source such as red or green is used and can be distinguished by a user more easily.

Description

technical field [0001] The invention relates to the technical field of photoelectric lighting and display, in particular to a retinoscopy mirror. Background technique [0002] The retinoscope is an instrument for measuring the refractive error and astigmatism axis of the human eye. It is equipped with an optical system for filament lighting and imaging. It is used to objectively measure the refractive state of the eyeball. The retinoscope is used to illuminate the inside of the eyeball, and the light is reflected from the retina Come back, these reflected light changes through the diopter of the eyeball, and the refractive state of the eyeball can be judged by checking the change of the reflected light. [0003] Retinoscopy mirrors can basically be divided into two types, band light and spot light. At present, the band light is generally used clinically for optometry. The band light system in the existing band light retinoscopy mirror uses the filament of a high-brightness ...

AI Technical Summary

Problems solved by technology

The examiner observes the change of the filament image and adjusts the distance between the projection mirror and the bulb at the same time to change the projection beam into a diverging beam or a converging beam for optometry. The disadvantage is that the strip image formed by the filament is not clear and uniform enough. The light energy utilization rate of the light source is not high, and the service life of the incandescent lamp is short

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