Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1978-04-04
1981-03-24
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
354 62, 351 14, A61B 314, G03B 2900
Patent
active
042576873
ABSTRACT:
An ophthalmoscopic instrument having an infrared image converter tube for observation and/or examination of an ocular fundus prior to recording an image thereof provided with a range finding device which assists in establishing a suitable working distance between an eye and an objective lens in the instrument optically aligned to each other. A light beam is projected onto the iris of an eye to be examined or the cornea thereof near or at the center and is transmitted by scattering reflection or regular reflection respectively from the iris or cornea to a photo-detecting system which produces an electrical output signal capable of reaching a peak value only when the transmitted light enters a slit ahead of a light sensitive surface or strikes that one of light sensitive segments which is adapted to be the most light responsive, as the device is moved in unison with the instrument body.
REFERENCES:
patent: 3724932 (1973-04-01), Cornsweet et al.
patent: 3813166 (1974-05-01), Mary
patent: 3864030 (1975-02-01), Cornsweet
patent: 3915564 (1975-10-01), Urban
patent: 4040740 (1977-08-01), Handtmann et al.
Crane et al., Accurate Three-Dimensional Eyetracker, App. Optics, v. 17n5, 3/78, pp. 691-705.
Bovernick Rodney B.
Canon Kabushiki Kaisha
Corbin John K.
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