Eye examining instrument

Details Eye examining instrument Eye examining instrument

1978-05-15

1981-02-17

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 13, 351 6, 354 62, A61B 310, A61B 314, G03B 2900

Patent

active

042511399

ABSTRACT:
Eye examining instrument is improved with respect to its spacing and alignment relative to a human eye to be examined is disclosed. For the purpose of the spacing and alignment, a non-imaging beam coming from a mark is directed to the cornea of the eye through an objective lens of the eye examining instrument. The beam is reflected upon the cornea surface in a manner of specular reflection and then imaged through the objective lens. The image of the mark is detected. At the position at which the image of mark is formed there is disposed, for transmitting the mark image to a television camera of the eye examining instrument, an input surface of a relay lens group or an input surface of a bundle of fibers or a photoelectric cell with its light receiving surface being partly covered with a masking plate.

REFERENCES:
patent: 3724923 (1973-04-01), Cornsweet et al.
patent: 3780979 (1973-12-01), de Guillebon
patent: 3864030 (1975-02-01), Cornsweet
patent: 3915564 (1974-09-01), Urban

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