Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1982-05-06
1983-06-28
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351237, A61B 310
Patent
active
043902553
ABSTRACT:
An eye-refractometer device has a beam splitter, a projection optical system provided in one light path of the beam splitter for projecting a light beam into the pupil of an eye to be examined and scanning the light beam, a condenser optical system provided in the other light path of the beam splitter for receiving the reflected light from the retina of the eye, the condenser optical system comprising a condenser lens, a diaphragm member and a light-receiving member, and a signal processing system for processing the signal from the light-receiving member. Light beam rotating means for rotating the light beam about the optic axis is provided between the beam splitter and the eye. The light-receiving member is fixedly disposed at a position substantially conjugate with the cornea of the eye with respect to the condenser lens and a plurality of light-receiving elements are provided on the light-receiving surface of the light-receiving member off the optic axis. The diaphragm member is fixedly disposed between the beam splitter and the light-receiving member. Phase difference detecting means for detecting the phase differences between the output signals from the plurality of light-receiving elements is provided as the signal processing system.
REFERENCES:
patent: 3136839 (1964-06-01), Safir
patent: 3715166 (1973-02-01), Leighty
patent: 4125320 (1978-11-01), Rassow et al.
Arai Toshiyuki
Nohda Masao
Umemura Izumi
Bovernick Rodney B.
Corbin John K.
Nippon Kogaku K.K.
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