Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – For interpupillary distance measuring or lens positioning
Patent
1998-05-26
1999-01-19
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
For interpupillary distance measuring or lens positioning
A61B 300
Patent
active
058619372
ABSTRACT:
An ophthalmic apparatus having an examining unit which examines an eye to be examined, the apparatus comprising an alignment device for aligning the examining unit with each of a right eye and a left eye, including a target optical system which forms an alignment target on one eye, a corneal reflex forming device including an emitting optical system by which a corneal reflex is formed on the other eye, in which the emitting optical system emitting a luminous flux on relatively wide area where is defined based on dispersion of an interpupillary distance of an examinee, and an optical axis of the emitting optical system and an optical axis of the examining unit being spaced at a predetermined distance, a detecting optical system for detecting a corneal reflection being in a direction intersecting with the optical axis of the emitting optical system, including a limiting device which limits incidence of the corneal reflection and a positional detecting device which detects a position of the limited corneal reflection, and a calculating device for judging whether the aligned eye is a right eye or a left eye and/or calculating an interpupillary distance thereof, based on results detected by the detecting optical system.
REFERENCES:
patent: 5463430 (1995-10-01), Isogai et al.
patent: 5757460 (1998-05-01), Cockley
patent: 5784145 (1998-07-01), Ghodse et al.
Manuel George
Nidek Co. Ltd.
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