Dot radial ringed placido

Details Dot radial ringed placido Dot radial ringed placido

2007-05-22

2007-05-22

Dang, Hung Xuan (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

Reexamination Certificate

active

11013597

ABSTRACT:
An ophthalmic placido pattern10is used to determine a curvature of an anterior surface of a cornea of an eye. The pattern10includes a series of alternating light and dark concentric rings12and14centered about a central point16. A series of shaped geometric shapes18and20are placed about at least some of the concentric rings12and14. The shapes18and20are of a contrasting color with respect to the ring12or14on which the shape18or20is placed.

REFERENCES:
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patent: 2004/0061833 (2004-04-01), Niven et al.
patent: WO 99/34725 (1999-07-01), None
International Search Report (PCT/ISA/220) and Written Opinion (PCA/ISA/237) mailed on Apr. 19, 2006.

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