Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1985-12-06
1988-08-02
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, A61B 310
Patent
active
047610700
ABSTRACT:
An eye refractometer is disclosed. It comprises a projection optical system including a light source portion and an objective lens disposed opposite to an eye under test, and a ring-shaped diaphragm or perforated mirror for forming a ring-shaped image pattern of the pupil of the eye and on the retina, a bundle of rays from the light source are projected to the eye under test through the objective lens and the diaphragm to form a ring-shaped pattern image at the retina of the eye under test through the peripheral area of a pupil surface of the eye under test; a light receiving optical system for receiving light reflected from the retina in a ring-shaped pattern image on a photo-electric detector through the central portion of the pupil; and a microprocessor for measuring the size and the configuration of the ring-shpaed pattern image from signals emitted from the photo-electric detector, and determining the refractivity of the eye under test therefrom.
REFERENCES:
patent: 4293198 (1981-10-01), Kohayakawa et al.
patent: 4376573 (1983-03-01), Matsumura et al.
patent: 4432617 (1984-02-01), Itoh et al.
Corbin John K.
Dzierzynski P. M.
Tokyo Kogaku Kikai Kabushiki Kaisha
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