Ophthalmologic apparatus with automatic focusing using two refer

Details Ophthalmologic apparatus with automatic focusing using two refer Ophthalmologic apparatus with automatic focusing using two refer

1995-06-05

1996-07-16

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351208, 351211, A61B 314

Patent

active

055371639

ABSTRACT:
An ophthalmologic apparatus is provided with an illuminating optical system for illuminating a fundus oculi of an inspected eye with an illuminating light, a photographing and observing optical system for photographing and observing the fundus oculi of the inspected eye illuminated with the illuminating light by the illuminating optical system, a reference mark projecting optical system for projecting a reference mark on the fundus oculi of the inspected eye, an in-focus detecting optical system for detecting an in-focus condition between the photographing and observing optical system and the fundus oculi of the inspected eye by receiving an image of the reference mark projected on the fundus oculi of the inspected eye by the reference mark projecting optical system, and positional adjustment detecting optical system for detecting a positional adjustment between the ophthalmologic apparatus and the inspected eye by receiving a beam of light which is radiated from the reference mark projecting optical system and is reflected by a cornea of the inspected eye. The reference mark projecting optical system has a light source for radiating a beam of infrared light and/or a beam of near infrared light.

REFERENCES:
patent: 4400070 (1983-08-01), Isono et al.
patent: 4673264 (1987-06-01), Takahashi
patent: 4712894 (1987-12-01), Nunokawa
patent: 4744648 (1988-05-01), Kato et al.

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