DOT RADIAL RINGED PLACIDO

摘要

An ophthalmic placido pattern (10) is used to determine a curvature of an anterior surface of a cornea of an eye. The pattern (10) includes a series of alternating light and dark concentric rings (12) and (14) centered about a central point (16). A series of shaped geometric shapes (18) and (20) are placed about at least some of the concentric rings (12) and (14). The shapes (18) and (20) are of a contrasting color with respect to the ring (12) or (14) on which the shape (18) or (20) is placed.