Ophthalmologic instrument

Details Ophthalmologic instrument Ophthalmologic instrument

1994-06-28

1995-11-21

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351208, A61B 310, A61B 314

Patent

active

054692334

ABSTRACT:
A sensor 17 detects a quantity of light emitted by an alignment light source 21 and reflected by an eye. A comparison circuit 53 compares a quantity of the reflected alignment light with a predetermined quantity of reference light. If the reflected alignment light is less in quantity than the reference light, the comparison circuit 53 judges that there exist stains which exert a bad influence on the reflected alignment light. An operator obtains the judgment through a monitor 52 by which cautions are offered, so that the operator can operate an instrument in the best condition.

REFERENCES:
patent: 4813778 (1989-03-01), Madate et al.
patent: 4834527 (1989-05-01), Kobayashi

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