Automated pocket-sized near vision tester

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type

Patent

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Details

351244, 351246, 351239, A61B 302

Patent

active

055682090

ABSTRACT:
A lightweight, pocket-sized, hand-held near vision test apparatus that selectively retroilluminates different near vision test objects located on an interchangeable near vision test card, or alternatively, selectively displays near vision test objects on a flat panel display screen. The apparatus allows the examiner to electronically direct the patient's attention to selected near vision test objects, while providing a baseline amount of contrast illumination.

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patent: 5416540 (1995-05-01), Hayashi
Gassovskii et al., "An instrument for testing vision and prescribing eyeglasses for close work", Mar. 1976, pp. 163-165.
Sheldrick, et al., "Study of Diagnostic Accord Between General Practitioners and An Ophthalmologist," British Medical Journal, vol. 304, pp. 1096-1098 (1992).
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VectorVision CSV-1000 Product Brochure (patented by Evans, U.S. Pat. No. 5,078,486), Jan. 7, 1992.

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