ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,426,780, issued on Sept. 30, was assigned to ALCON INC. (Fribourg, Switzerland).
"Placido pattern for a corneal topographer" was invented by Peter Zieger (Berlin) and Horia Grecu (Berlin).
According to the abstract* released by the U.S. Patent & Trademark Office: "In certain embodiments, an ophthalmic system for determining the topography of the anterior surface of the cornea of an eye comprises an illuminator, a camera, and a computer. The illuminator illuminates the anterior surface of the cornea of the eye with a Placido pattern. The Placido pattern comprises a plurality of rings. A ring of the plurality of rings has a distinguishing feature that distinguishes the ring from an ad...