Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1992-01-28
1994-05-03
Ben, Loha
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351206, 351211, A61B 314, A61B 310
Patent
active
053091868
ABSTRACT:
An eye refractive power measuring apparatus having an opacity discriminant function of a crystalline lens comprising a projecting optical system for projecting a target for eye refractive power measurement onto a fundus of an eye to be examined, a detecting optical system for detecting the target image reflected from the eye fundus, a device coupled to the detecting optical system for measuring refractive power of the eye in response to the detected target image, an irradiating optical system for irradiating the eye fundus with a retroillumination light, and an observing optical system for observing a crystalline lens of the eye illuminated by the retroillumination light reflected from the eye fundus to determine the opacity of the crystalline lens.
REFERENCES:
patent: 4376573 (1983-03-01), Matsumura et al.
patent: 4711540 (1987-12-01), Yoshino et al.
patent: 4744648 (1988-05-01), Kato et al.
patent: 4755041 (1988-07-01), Ishikawa et al.
patent: 4917480 (1990-04-01), Kato et al.
patent: 5202708 (1993-04-01), Sasaki et al.
Ben Loha
Nguyen Thong
Nidek Co. Ltd.
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