Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1978-07-03
1980-01-01
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
351 13, 351 16, A61B 310
Patent
active
041814070
ABSTRACT:
Apparatus for automatically testing a patient's vision includes a target, at least one lens, and an eyepiece serially aligned along one optical path. A motorized drive circuit moves the target or lens to selectable positions along the optical path in response to first digital control signals; while a light drive circuit enables light stimulus to be directed along the optical path through the target, lens and eyepiece at each selectable position in response to second digital control signals.
A digital control circuit has outputs coupled to the motorized drive circuit and to the light drive circuit for generating the first and second digital control signals in a predetermined sequence. Inputs on the control circuit receive electrical signals evoked in the brain of the patient by to the light stimulus. The control circuit measures the time delay between said light stimulus and said evoked response at each of said selectable positions, and generates a corrective prescription based on the selectable position which yields the longest response time.
REFERENCES:
patent: 3574450 (1971-04-01), White
Bovernick Rodney B.
Corbin John K.
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