Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1993-04-02
1994-09-20
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, 351221, A61B 310
Patent
active
053493990
ABSTRACT:
To obviate the influence of, for example, birefringence of an eyeball, an intraocular length measuring instrument includes a light source portion for emitting a measuring beam of linearly polarized light; a beam splitter for separating a beam of light reflected by an intraocular object to be measured from the measuring beam of light projected from the light source portion onto the intraocular object; a light receiving portion for receiving the reflected beam of light separated by the beam splitter; and a phase compensating means disposed between the eye to be measured and the beam splitter, for transforming the beam reflected from the intraocular object into a beam of light with a polarization component substantially perpendicular to the measuring beam of linearly polarized light emitted from the light source portion.
REFERENCES:
patent: 4153335 (1979-05-01), Buchan
patent: 4636088 (1987-01-01), Rosencwaig et al.
patent: 5141302 (1992-08-01), Arai et al.
Dang Hung Xuan
Kabushiki Kaisha Topcon
Sikes William L.
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