Active pupillary prosthesis

Details Active pupillary prosthesis Active pupillary prosthesis

1991-01-07

1992-04-28

Shay, Randy C.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Eye prosthesis

446389, 446392, A61F 214

Patent

active

051084279

ABSTRACT:
An ocular prothesis is provided in which a prosthesis housing has a bore therein for receiving elements to simulate the iris and pupil of an eye. A black disc is received within the bore and covered by an active disc having a central aperture therethrough exposing a portion of the black disc to represent maximum pupil constriction. The active disc has one or more rings concentric with the aperture, such rings being made from a photochromic material such that at various light intensities the rings change from translucent to opaque. Accordingly, at low light levels with the rings transparent, a greater portion of the black disc is apparent, giving the appearance of a dilated pupil. As light levels increase, the rings sequentially become opaque from the largest ring to the smallest, giving the appearance of pupil constriction.

REFERENCES:
patent: 2721316 (1955-10-01), Shaw
patent: 2760483 (1956-08-01), Tassicker
patent: 3480971 (1969-12-01), Smith
patent: 3507552 (1970-04-01), Scott
patent: 4272910 (1981-06-01), Danz
patent: 4332039 (1982-06-01), LaFaente
patent: 4436376 (1984-03-01), Fergason
patent: 4551149 (1985-11-01), Sciarra
patent: 4601545 (1986-07-01), Kern

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