Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1988-08-29
1990-08-28
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 310
Patent
active
049520490
ABSTRACT:
An eye refractometer comprising a projection optical system for projecting an index mark onto an eye fundus of an eye to be examined through a first aperture stop disposed substantially conjugate with the pupil of the eye, a measuring optical system for guiding to a light-position detecting device the light beam of the index mark reflected from the eye fundus through a second aperture stop disposed substantially conjugate with the pupil and a device for calculating the refractive value of the eye from the output of the light-position detecting device, at least one of the first and second aperture stops having an area type opening.
REFERENCES:
patent: 4283124 (1981-08-01), Matsumura
patent: 4293198 (1981-10-01), Kohayakawa et al.
patent: 4421391 (1983-12-01), Matsumura et al.
Canon Kabushiki Kaisha
Dzierzynski Paul M.
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