Eye refractometer having a viewing target projecting system

Details Eye refractometer having a viewing target projecting system Eye refractometer having a viewing target projecting system

1980-05-15

1981-12-08

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 14, 351 16, A61B 310

Patent

active

043044689

ABSTRACT:
An eye refractometer including a measuring target projecting optical system for projecting a measuring target to a patient's eye using an infrared ray. A viewing target is provided in the projecting system and located more distant from the patient's eye than the measuring target. A filter is located between the two targets and has a portion which is transparent to visible light and corresponds to the viewing target. The remainder of the filter is opaque to the visible light but transparent to infrared ray. The two targets and the filter are assembled together so that they are moved as a unit.

REFERENCES:
patent: 4021102 (1977-05-01), Iizuka

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