Binocular indirect ophthalmoscope

Details Binocular indirect ophthalmoscope Binocular indirect ophthalmoscope

1988-04-29

1989-03-07

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351245, A61B 310

Patent

active

048100838

ABSTRACT:
The invention provides a binocular indirect ophthalmoscope in which light reflected from an eye under test is split and guided to left and right oculars (7, 8). Left and right mirrors (10, 11) for directing the split light to the left and right oculars being laterally movable about the optical axes (01, 02) of the oculars and toward and away from each other. The mirrors are arranged to follow the mutual approaching and receding of the oculars but the oculars will not follow the mutual approaching and receding of the mirrors, whereby the distance between these mirrors can be adjusted separately from the distance between the optical axes of the oculars.
Such arrangement allows the operator to shift the light beams for observation (OFL, OFR) to appropriate positions where they are not interrupted by the iris, and thus allows sufficient and widely ranging stereoscopic observation, irrespective of the size of the pupil diameter of the eye under test or OF the direction of observation. Further, the distance between the oculars can easily and rapidly be adjusted for adaptation to different operators having different eye-to-eye distances.

REFERENCES:
patent: 4219257 (1980-08-01), Slappey et al.

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