US 4,784,483 A · Brightness acuity tester

Abstract

A brightness acuity tester to assess functional visual acuity in bright light conditions and to test for recovery of visual activity after photostressing the retina is disclosed. The tester essentially comprises a device closed in one direction and open in an opposite direction, an aperture provided in the device, a source of illumination mounted within the device, a plug designed removably to be positioned in the aperture to seal the same, and a power source coupled to the source of illumination via a switch. Preferably, the source of illumination is provided with anintensity control and the power source with a voltage regulator. Preferably, the device comprises a reflector having diffusely reflecting characteristics. Preferably, the power source is a battery, making the tester a hand-held one.

Claims22

Dependent claims

A brightness acuity tester comprising:

(a) a portable device closed in one direction and open in a diametrically opposed direction;
the periphery of said opening being sized such that the periphery of the opening is closely adjacent the eye;
(b) said device provided with a handle;
(c) an aperture provided in said device in said closed direction;
(d) a plug member designed removably to be mounted within said aperture;
(e) a source of illumination mounted within said device;
and
(f) a power source coupled to said source of illumination.

5 more elements

Dependencies are inferred from the claim text.

Brightness acuity tester

Life of this patent

Brightness acuity tester

Life of this patent

Abstract

Claims22