Vision testing instrument

Details Vision testing instrument Vision testing instrument

1980-04-21

1981-11-10

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 27, A61B 302

Patent

active

042994551

ABSTRACT:
A vision testing instrument has a projecting optical system for projecting a test chart to produce an aerial image. In the optical system, there is provided a focusing reflector for producing a chart image at a far point. A second focusing reflector is provided so that it can be retractably inserted into the projecting optical path for producing a chart image at a near point.

REFERENCES:
patent: 4179196 (1979-12-01), Persson

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