Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1988-08-15
1989-04-11
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351206, A61B 310, A61B 314
Patent
active
048200379
ABSTRACT:
An apparatus for measuring the refractive power of an eye has a target projecting system for projecting a target light beam onto the fundus of an eye to be examined through a predetermined region of the pupil of the eye to be examined, and a light-receiving optical system for receiving a light beam reflected by the eye fundus in at least three meridian directions through a region of the pupil of the eye to be examined different from the predetermined region. The light-receiving optical system includes a plurality of image rotating prisms for converting into a predetermined direction the direction of displacement to each meridian direction of the light beam reflected by the eye fundus produced by the difference in the refractive power of the eye to be examined. A light detecting device has a direction of light detection coincident with the predetermined direction and detects the light-position of the light beam reflected by the eye fundus which depends on the refractive power of the eye to be examined.
REFERENCES:
patent: 4306778 (1981-12-01), Wada et al.
patent: 4376573 (1983-03-01), Matsumura et al.
patent: 4410243 (1983-10-01), Furste
Kohayakawa Yoshimi
Matsumoto Kazuhiro
Bovernick Rodney B.
Canon Kabushiki Kaisha
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