Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1996-01-03
1997-07-08
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351200, 351243, A61B 302, A61B 300
Patent
active
056467109
ABSTRACT:
An improved ophthalmological self test unit for assisting in the self evaluation of the degenerative effects of certain eye disorders. The self diagnostic ophthalmological device includes a grid area having a re-writable surface which is fixably attached to a magnetic backed material for ease of attachment to any metallic surface such as might often be found on a refrigerator. Disposed on the grid surface is a central focusing means for assisting in the focusing of a patient's attention to the central portion of the high contrast grid structure. In an alternative embodiment a polar grid is utilized along with the central focusing means mounted upon the magnetic backed material.
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patent: 5067806 (1991-11-01), Kwasman
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