Eye examining apparatus

Details Eye examining apparatus Eye examining apparatus

1981-03-03

1984-02-14

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

044312784

ABSTRACT:
Improvements in an eye examining apparatus of the type having eye fixation mark means, eye refractive power measuring means and control means for moving an image of the fixation mark depending upon the output signal from said measuring means are disclosed. Said control means comprises means for detecting the position of the fixation mark image and means for detecting the difference between the level of signal from said position detecting means and the level of output from said measuring means. When the detected difference is within a predetermined range of values, the image of fixation mark is moved by a predetermined distance.

REFERENCES:
patent: 3819256 (1974-06-01), Bellows et al.
patent: 4190332 (1980-02-01), Body et al.

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