Apparatus for measuring an intraocular length between anterior a

Details Apparatus for measuring an intraocular length between anterior a Apparatus for measuring an intraocular length between anterior a

1992-04-21

1994-09-13

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 351221, A61B 310

Patent

active

053473280

ABSTRACT:
An apparatus for measuring an eye axial length includes a measuring optical system for projecting laser beam onto an eye and making interference between light reflected by the cornea of the eye and light reflected by the retina of the eye. The measuring optical system includes beam splitting means for splitting the beams of light reflected by the cornea and the retina each into two each for different optical systems, a cornea reflected light receiving optical system for receiving the light reflected by the cornea, a retina reflected light receiving optical system for receiving the light reflected by the retina, and an interference light receiving optical system for reuniting each reflected light at the substantially identical wave front and receiving interference light.

REFERENCES:
patent: 4796989 (1989-01-01), Fukuma et al.
patent: 4859051 (1989-08-01), Fukuma et al.
patent: 5141302 (1992-08-01), Arai et al.

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