Portable, public use reading glasses eye tester

Details Portable, public use reading glasses eye tester Portable, public use reading glasses eye tester

1994-06-06

1996-01-23

Gross, Anita Pellman

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351234, 351239, A61B 302

Patent

active

054868793

ABSTRACT:
Two identical plates somewhat in the shape of very large eyeglass frames sandwiching two rotable discs, one for each eye, form the front section of the device. Each disc has a series of magnifying lenses of increasing power which can be brought into the eye openings in the plate when the discs are rotated and allow the user to focus on a group of alphbetical characters of a predetermined size and at a predetermined distance from the lenses at the end of a view tunnel. The strength of the lenses required for focusing can then be read from the disc where it is clearly indicated next to each lens. These lens strengths correspond to the power of reading glasses sold non-prescription in most drug stores.

REFERENCES:
patent: 1384252 (1921-07-01), Giddens
patent: 4896959 (1990-01-01), O'Brien

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