Scanning optical apparatus and method

Details Scanning optical apparatus and method Scanning optical apparatus and method

1987-09-10

1988-09-06

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, A61B 314

Patent

active

047688742

ABSTRACT:
An optical apparatus for providing a two-dimensional output representation of reflection characteristics of an eye fundus in which a laser beam is passed through an anamorphic optical element to produce an output beam focused on a first axis and dispersed on a second axis normal to the first axis forming a line. The line of the output beam is directed onto a scanning element which moves the beam along the first axis and a focusing element directing the output beam from the scanning element through the pupil of the eye onto the fundus, the size of the beam being such that it has a small cross sectional area at the pupillary plane of the eye compared to the diameter of the pupil. The light from the fundus is reflected back through an exit aperture which is large compared to the cross sectional dimension of the input beam at the pupillary plane. The device includes a detector which extends along the non-scanning coordinate of the scanned area. A beam separating means separates the input laser beam from the reflected output beam which is directed toward the detector positioned at a retinal conjugate of the eye. Signal processing means processes the signals received at the detector to provide the two-dimensional output representation.

REFERENCES:
patent: 4213678 (1980-07-01), Pomerantzeff et al.
patent: 4579430 (1986-04-01), Bille

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