Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1978-10-31
1980-09-16
Sacher, Paul A.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
351 32, 351 36, 351 37, A61B 308
Patent
active
042226392
ABSTRACT:
Apparatus is provided for testing subjects for fixation disparity. The apparatus includes a first sheet-like element having an opening therein which is spaced from the subject being tested. This opening defines the periphery of a target which is dimensioned to represent a fusion stimulus to the subject. Within the opening there are displayed a sequence of paired first and second discrete, parallel target elements which are mutually spaced and fixed a predetermined distance from each other along the parallel lengthwise extends thereof. A sequence of these element pairs are positioned in regularly spaced order about a movable carrier and presented sequentially at the opening in the course of testing. The angular subtense represented by the spacing of the elements is indicated upon the carrier and when the subject perceives that the elements are mutually aligned, a recordation of angular subtense is made and utilized for diagnostic purposes.
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F. Hebbard, "Foveal Fixation . . . ," Am. J. Optom. & Arch Am. Ac. Optom, vol. 37, No. 1, Jan. 1960.
Sacher Paul A.
Smith Gerald L.
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