Ophthalmologic apparatus

Details Ophthalmologic apparatus Ophthalmologic apparatus

1999-05-03

2000-10-17

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 314

Patent

active

061320463

ABSTRACT:
In an ophthalmologic apparatus which can start a measurement or a photographing operation with respect to an eye to be examined by suitably making an automatic alignment with a cornea of the eye as a center, When a diseased eye is to be measured, slight reflected light (e.g., cornea scattering light) except for reflected light from a vertex of the cornea of the eye is interrupted by an XY alignment detecting stop even when this slight reflected light is detected by a position detecting sensor. Accordingly, since no slight reflected light is almost incident to a light quantity detecting sensor, the XY alignment light quantity detecting circuit does not output an alignment completion signal to a control circuit. Thus, the control circuit performs a control operation such that the measurement or the photographing operation with respect to the eye is not performed.

REFERENCES:
patent: 5621457 (1997-04-01), Ishiwaka et al.
patent: 5668622 (1997-09-01), Charbonnier et al.
patent: 5682224 (1997-10-01), Takagi et al.
patent: 5987151 (1999-11-01), Akashi

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