Intraocular length measuring instrument having phase compensatin

Details Intraocular length measuring instrument having phase compensatin Intraocular length measuring instrument having phase compensatin

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.

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