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US 2006/0132712 A1Published application
Dot radial ringed placido
AssigneeBausch & Lomb Incorporated
InventorsDonald Grove, Lloyd Allred
Life of this patent
Estimating the term…
Abstract
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.
Claims5
An ophthalmic placido pattern for use in determining a curvature of an anterior surface of a cornea of an eye, the pattern comprising:
- a series of alternating light and dark concentric rings centered about a central point;
- a series of spaced geometric shapes placed about at least some of the concentric rings, wherein the shapes are of a contrasting color with respect to the ring or which the shape is placed.
Dependencies are inferred from the claim text.