Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1987-02-17
1989-08-15
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351206, 351211, 351220, 351246, A61B 310
Patent
active
048568910
ABSTRACT:
An eye movement tracker for stabilizing in two dimensions a diagnostic, treatment or other ophthalmic illumination on the fundus has a laser source which produces a narrow directed tracking beam, an optical steering assembly for controllably directing the beam to illuminate a region of the fundus, and an optical imaging assembly for imaging the illuminated region on a spatially-distributed photodetecting element. A tracking circuit scans the detecting element to detect motion of a spatially variant intensity feature and controls the optical steering assembly to redirect the optical path and maintain the feature in a fixed position. This repositions the diagnostic or other illumination, maintaining it in a fixed position on the fundus during eye movement. Scanning rates many times those of conventional systems are achieved, effectively stabilizing even very rapid eye movements. A viewing port provides an operator with a 30 degree field of the subject's eye fundus.
REFERENCES:
patent: 4257688 (1981-03-01), Matsumura
patent: 4443075 (1984-04-01), Crane
patent: 4579430 (1986-04-01), Bille
Confocal Scanning Laser Ophthalmoscope, Robert H. Webb and George W. Hughes to appear in Applied Optics, Special Fall 1986 Issue.
Ophthalmoscopie for Balayage Optique J. Cohen Sabban et al., Innov. Tech Biol. Med.; vol. 5, No. 2, 1984, pp. 116-128 (translation supplied).
Milbocker Michael T.
Pflibsen Kent P.
Bovernick Rodney B.
Eye Research Institute of Retina Foundation
Ryan Jay Patrick
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