Oblique illumination device for use with an ophthalmic microscop

Details Oblique illumination device for use with an ophthalmic microscop Oblique illumination device for use with an ophthalmic microscop

1990-10-25

1992-10-13

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, 351221, A61B 310

Patent

active

051555093

ABSTRACT:
Oblique illumination system is provided for use with an ophthalmic microscope having a direct illumination system. The apparatus includes a first light deflector for deflecting light in the direct illumination axis transversely along a transverse axis. A first support movably connects the first light deflector to enable it to be shifted into and out of the direct illumination axis; a second light deflector redirects the light in the transverse axis along an oblique axis which intersects the microscope axis at the focal plane. The first light deflector can be alternatively shifted to vary the microscope between the direct and indirect illumination modes to minimize the duration of the exposure of the eye macula to the illumination system during a surgical procedure. A method for converting a conventional direct illumination operating microscope for use as an indirect illumination microscope is also provided.

REFERENCES:
patent: 3944343 (1976-03-01), Mueller, Jr.
patent: 4932774 (1990-06-01), Takagi et al.
Survey of Ophthalmology, Jan.-Feb., 1990, article by Michels and Sternberg, "Operating Microscope-Induced Retinal Photoxicity; Pathophysiology, Clinical Manifestations and Prevention".

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