Ophthalmometer

Details Ophthalmometer Ophthalmometer

1978-04-18

1980-03-11

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 29, A61B 302

Patent

active

041925823

ABSTRACT:
Ophthalmometer comprising a chart projecting optical system for projecting a Landolt type inspection chart and a lens means for locating a corrective lens in the projecting light path. A manually operated switch is provided for actuation by a patient. A mark is presented and moved around the projected chart image for the purpose of having the patient actuate the switch when the mark is at a position corresponding to the slit of the chart. When the switch is actuated at a correct time, the chart advanced by one step but when the switch is actuated at an incorrect timing the lens of next larger dioptral valve is placed in the projecting light path.

REFERENCES:
patent: 3969020 (1976-07-01), Lynn et al.

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