Dot radial ringed placido

Details Dot radial ringed placido Dot radial ringed placido

A - Human Necessities

61

B

A61B 3/107 (2006.01)

Patent

CA 2590302

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.

La présente invention concerne un motif de placido ophtalmique (10) utilisé pour déterminer la courbure d~une surface antérieure d~une cornée oculaire. Le motif (10) comprend une série d~anneaux concentriques clairs et sombres alternés (12) et (14) centrés autour d~un point central (16). Une série de formes géométriques façonnées (18) et (20) est placée autour d~au moins certains des anneaux concentriques (12) et (14). Les formes (18) et (20) ont une couleur qui produit un contraste avec l~anneau (12) ou (14) sur laquelle la forme (18) ou (20) est placée.

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