US Patent:
20080074619, Mar 27, 2008
Inventors:
Andrew Gisonna - Oakland NJ, US
International Classification:
A61B 3/04
Abstract:
A reading glass strength self-tester comprising a housing that incorporates a viewport in the front of the housing. Magnifying lens of different diopter ratings are mounted behind the viewport to magnify a reading surface located within the housing. A window incorporated into the front of the housing displays the diopter ratings of the lenses. The lenses can be advanced by the user behind the viewport for viewing by the user. At least one mirror located behind the lenses directs the image on the reading surface along a non-linear viewing path in relation to the viewport. A non-ambient light source mounted inside the housing illuminates the reading surface. A power source is connected to the light source by electrical means, which can be turned on by the user. The user can use the self-tester to determine the appropriate strength of non-prescription reading glasses required to improve or correct the consumer's farsightedness by magnifying images reaching the eye.