Eye refractometer having variable wavelength illumination means

Details Eye refractometer having variable wavelength illumination means Eye refractometer having variable wavelength illumination means

1993-03-26

1995-11-14

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, A61B 3103

Patent

active

054671515

ABSTRACT:
An eye refractometer has an illumination system for irradiating a fundus of an examined eye with measurement light, and a light receiving system for receiving a light beam from the fundus of the examined eye irradiated with the measurement light. The illumination system can change the measurement light between visible light and infrared light, and can emit the visible light in a flashing manner. Eye refraction information of the examined eye is detected on the basis of light reception through the light receiving system, and the difference between detection values of the eye refraction information before and after a change of the measurement light.

REFERENCES:
patent: 3572909 (1971-03-01), VanPatten et al.
patent: 3819256 (1974-06-01), Bellows et al.
patent: 3879113 (1975-04-01), Howland et al.
patent: 4306778 (1981-12-01), Wada et al.
patent: 4702596 (1987-10-01), Nohda
patent: 4755041 (1988-07-01), Ishikawa
patent: 4938584 (1990-07-01), Suematsu et al.

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