Eyeglass display rack with vision tester

Details Eyeglass display rack with vision tester Eyeglass display rack with vision tester

1997-03-18

1999-01-19

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Support

351223, 351234, 351243, A61B 300, A61B 302

Patent

active

058619410

ABSTRACT:
A vision tester comprising a front wall and a back wall. Printed matter comprising words appears on the back wall, which is approximately 14 inches (35.6 cm.) from the front wall. The printed matter is exposed to ambient light from the top and front. The front wall has an opening through which the user of the vision tester looks. A plurality of magnifying lenses, of different diopter ratings, are selectively positionable behind the opening. Indicia appear to indicate the diopter rating of each lens. The user of the vision tester can determine the diopter rating of the appropriate lens needed for reading by determining which lens renders the printed matter clear and readable.

REFERENCES:
patent: 1228020 (1917-05-01), Herrick
patent: 1284103 (1918-11-01), Herrick
patent: 1384252 (1921-07-01), Giddens
patent: 1416159 (1922-05-01), Barr
patent: 1437776 (1922-12-01), Reese et al.
patent: 4896959 (1990-01-01), O'Brien
patent: 5486879 (1996-01-01), Barnett

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