Eye refractive power measuring apparatus

Details Eye refractive power measuring apparatus Eye refractive power measuring apparatus

1988-11-28

1990-04-17

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351237, A61B 302, A61B 310

Patent

active

049174800

ABSTRACT:
An eye refractive power measuring apparatus is disclosed. It includes a chart projection system for projecting a chart image for test use to a retina of an eye under test by using visible light, a measuring target projection system for projecting a measuring target image to the retina of the eye under test by using invisible light, a display device for displaying the measuring target image as a visible image, a focussing state of the measuring target image being made changeable simultaneous with change of a focussing state of the chart image for test.

REFERENCES:
patent: 3525565 (1970-08-01), O'Neill et al.
patent: 4173398 (1979-11-01), Okamoto et al.
patent: 4277150 (1981-07-01), Wada et al.
patent: 4293199 (1981-10-01), Wada et al.
patent: 4304468 (1981-12-01), Wada
patent: 4306778 (1981-12-01), Wada et al.

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