Optical characteristic measuring apparatus

Details Optical characteristic measuring apparatus Optical characteristic measuring apparatus

1998-11-12

2000-03-28

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

060422335

ABSTRACT:
Disclosed is an optical characteristic measuring apparatus for precisely measuring optical characteristics of an eye to be examined by projecting a specific pattern on the retina of the eye. In particular, the measuring apparatus is capable of measuring an irregular astigmatism component. In this apparatus, an illuminating optical system illuminates the retina of an eye to be examined via an illuminating state changing unit capable of changing an illuminating state created by light rays emitted from the light source; a light receiving optical system receives light rays reflected back from the retina of the eye and guides the reflected light rays to a light receiving unit; and an optical characteristic arithmetic unit determines optical characteristics of the eye on the basis of a signal outputted from the light receiving unit. The above illuminating state changing unit changes, on the basis of the optical characteristics obtained by the optical characteristic arithmetic unit, the illuminating state of the illuminating optical system such that the illuminating optical system illuminates a minute region on the retina of the eye.

REFERENCES:
patent: 5537164 (1996-07-01), Smith
patent: 5576780 (1996-11-01), Yancey
patent: 5623323 (1997-04-01), Johnson et al.

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