Eye examining instrument with variable intensity of illumination

Details Eye examining instrument with variable intensity of illumination Eye examining instrument with variable intensity of illumination

1979-04-23

1984-03-27

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, A61B 314, G03B 2900

Patent

active

044390246

ABSTRACT:
In the disclosed eye examining instrument, an eye inspection system forms a first optical path and an eye illuminating system forms a second optical path which begins outside the first optical path and then extends along the optical axis of the first optical path near the eye. A shading member in the optical path of the illuminating member is substantially conjugate with the pupil of the eye and cooperates with variable limiting means that vary the shading. In one embodiment, the variable limiting means is a second shading member movable toward and away from the first shading member along the optical path of the illuminating system and conjugate with an interior portion of the eye so as selectively to block out portions of the unshaded light reaching the eye fundus.

REFERENCES:
patent: 4068932 (1978-01-01), Ohta et al.
patent: 4102563 (1978-07-01), Matsumura et al.

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