Eye testing instrument

Details Eye testing instrument Eye testing instrument

1978-05-05

1981-03-03

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 6, 351 13, 354 62, A61B 310, A61B 314, G03B 2900

Patent

active

042537436

ABSTRACT:
An eye testing instrument is disclosed in which accurate aligning and spacing are obtained relative to the human eye to be tested. At least one indication mark is imaged on the cornea or iris of the eye through an objective lens of the instrument and the image of the mark is observed by the inspector. When the image of the mark appears in a predetermined position in the view field, it indicates that the instrument is in a correct position of alignment. Also, the image of the mark appears sharply and clearly whenever an accurate spacing is achieved. Therefore, the necessary adjustment of the testing instrument can be made by moving it relative to the eye backward and forward, up and down and rightward and leftward until a sharp and clear image of the indication mark appears at a predetermined position in the view field.

REFERENCES:
patent: 3780979 (1973-12-01), de Guillebon
patent: 3819256 (1974-06-01), Bellows et al.
patent: 3864030 (1975-02-01), Cornsweet
patent: 3871772 (1975-03-01), Munnerlyn et al.
patent: 3915564 (1975-10-01), Urban
patent: 3925793 (1975-12-01), Matsumura et al.

Affiliated with

Also associated with

Rating

Eye testing instrument does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Eye testing instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eye testing instrument will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-76965