Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1990-05-11
1992-03-10
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
359861, A61B 310
Patent
active
050945238
ABSTRACT:
An optical steering assembly includes first and second steering elements, such as orthogonally-oriented glavanometer mirrors, scanners or acousto-optical cells, for redirecting light in both forward and return optical paths without crosstalk or mixing. Input light traveling in the first direction is directed from the first side of the first element to the first side of the second element, undergoing two orthogonal steering deflections to a redirected output path. Return light along the same or a closely adjacent path is directed at the second side of one element, where an optical relay system tranlates it to the second side of the other element. The return light thus strikes the opposite sides of the same elements as the input light, and undergoes corresponding steering corrections while maintaining complete beam separation. The assembly is especially useful in instruments where low light levels, scan distortion, or crosstalk would otherwise limit performance. A two dimensional fundus tracker employs one such assembly as an objective steering system for all illumination, and two further assemblies for positioning tracking beams directed into the objective steering system.
REFERENCES:
patent: 4768873 (1988-09-01), Webb
patent: 4856891 (1989-08-01), Pflibsen et al.
Milbocker Michael T.
Reznichenko Yakov
Dzierzynski Paul M.
Eye Research Institute of Retina Foundation
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