Single-curvature placido plate

Details Single-curvature placido plate Single-curvature placido plate

1997-04-24

1999-01-26

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351 47, A61B 310

Patent

active

058643834

ABSTRACT:
An apparatus for analyzing a subject's cornea includes a frame having first and second ends, a single curvature (i.e. non-planar and non-axisymmetrical) screen associated with the first end of the frame, the non-planar and non-axisymmetrical screen having an opaque covering which is interrupted along its surface to form a pattern. A light source is disposed to cast the pattern placed on the screen onto the subject's cornea, thus causing a pattern to reflect therefrom. A light detector (e.g. a camera, CCD, or human eye) is disposed to sense the pattern reflected from the subject's cornea. The improved Placido plate is easier to manufacture. The design allows for incorporation of extremely complex pattern shapes, while its shape helps to maintain focus of the image.

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Orbtek brochures, "Orbscan Total Anterior Chamber Eye Exam", 7 pages.

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