Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1993-01-04
1994-06-28
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351203, 351239, A61B 302
Patent
active
053251369
ABSTRACT:
An improved vision tester apparatus and method are disclosed for use in conducting optometric examinations of patients who use video display terminals (VDTs). Specifically, the tester simulates images that are displayed to the patient by a typical VDT, so as to facilitate prescribing corrective lenses that will perform well for the patient when used with an actual VDT. The tester (10) includes a flat-panel electroluminescent light source (32) for illuminating a screen (14) without hot spots. The screen includes a colored ink layer (78,80,82) and an opaque ink mask (70) for forming pixel-like light elements (24). Lensing structures (52,56,58,60) degrade the image such that each light element exhibits a generally Gaussian light amplitude curve (FIG. 5B) characteristic of a pixel of an actual VDT. A rechargeable battery (34) coupled to a inverter circuit (30) provide portable power for the EL panel to complete a compact, portable tester.
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Salibello Cosmo
Torrey Jonathan G.
Parsons David R.
PRIO Corporation
Sikes William L.
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