Illuminating device in an ophthalmometer

Details Illuminating device in an ophthalmometer Illuminating device in an ophthalmometer

1974-05-16

1976-01-13

Kaufman, Nathan

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 13, A61B 300

Patent

active

039320308

ABSTRACT:
In an ophthalmometer comprising a chart plate, an illuminating device for illuminating the chart plate, a viewing optical system having an optical measurement adjust member for viewing therethrough the chart image projected by the illuminating device upon the cornea of an eye to be examined, a scale read-out device movable with the optical member and having a cornea curvature radius scale plate, and an astigmatism axis angle scale plate, the illuminating device comprises a chart illuminating light source member disposed behind the chart and within the viewing optical system and being in an annular form corresponding to the configuration of the chart of the chart plate. The illuminating device further includes a reflector member having light-transmitting portions for directing therethrough light beams for illuminating the two scale plates, respectively.

REFERENCES:
patent: 2902899 (1959-09-01), Cuppers et al.
patent: 3542458 (1970-11-01), Volk

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