Single-curvature placido plate with additional surfaces

Details Single-curvature placido plate with additional surfaces Single-curvature placido plate with additional surfaces

2005-02-01

2005-02-01

Casler, Brian L. (Department: 3737)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

Reexamination Certificate

active

06848791

ABSTRACT:
A placido device10includes a single-curvature, semi-circular screen12having an opaque covering which is interrupted along its surface to form an illuminated pattern. A flat top14is attached to the top of the screen12and angled from the screen front28towards the screen bottom26. Also, a flat bottom16is attached to the bottom of the screen12and angled from the screen front28towards the screen top24.

REFERENCES:
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patent: 5841511 (1998-11-01), D'Souza et al.
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patent: 6190011 (2001-02-01), Fujieda
patent: 6193371 (2001-02-01), Snook
patent: 6234632 (2001-05-01), Nakao
patent: 6382796 (2002-05-01), Ban
patent: 20030231284 (2003-12-01), Lee et al.
patent: 2284766 (1995-06-01), None

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