Presbyometer including lockstep means

Details Presbyometer including lockstep means Presbyometer including lockstep means

1995-09-28

1998-03-17

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351234, 351239, A61B 302

Patent

active

057293244

ABSTRACT:
A presbyometer for aid in selecting the appropriate strength of over-the-counter (OTC) reading glasses is disclosed. The device comprises a view assembly with a pair of rotational lens wheels. The lens wheels each have a plurality of spaced apart apertures, each having a lens of differing dioptric strength. A user looks through the first lens on each lens wheel toward a back plate having a visual target. The lens wheels are rotated, thereby bringing a lens of increasing Diopter strength into exposure. When the user can adequately read the stimulus, the correct level of Diopter strength correction is identified and corresponding OTC glasses are purchased. A ocular width adjustment means is also disclosed.

REFERENCES:
patent: 1384252 (1921-07-01), Giddens
patent: 2171881 (1939-09-01), Luckiesh et al.
patent: 4385813 (1983-05-01), Klein et al.
patent: 4887897 (1989-12-01), Nose et al.
patent: 5110199 (1992-05-01), Ishiog
patent: 5223864 (1993-06-01), Twisselmann
patent: 5486879 (1996-01-01), Barnett

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