Binocular ophthalmoscope

Details Binocular ophthalmoscope Binocular ophthalmoscope

1984-09-12

1987-01-20

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, A61B 310

Patent

active

046376992

ABSTRACT:
A binocular ophthalmoscope, having an optical viewing system, a light source and headgear mountable on an examiner's head during use for supporting the optical viewing system in optical alignment with the examiner's eyes and the light source with the output thereof above the optical viewing system. The light source has a selector for selectively providing both full beam and slit beam illumination of a patient's eye, a first condensing lens for focusing light on the bull beam or slit beam aperture, a second condensing lens for refocusing the light passing through the aperture onto an aerial image of the retina, and a third lens for shortening the focal length of the beam emitted from the light outlet of the light source and which is mounting for pivotal movement into and out of the beam path.

REFERENCES:
patent: 2757574 (1956-08-01), Thornburn

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