ALEXANDRIA, Va., March 26 -- United States Patent no. 12,259,596, issued on March 25, was assigned to MDCO TECHNOLOGY Ltd. (Hangzhou, China).
"Ophthalmic lens having extended depth of field" was invented by Xin Wei (Hangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to an ophthalmic lens with an extended depth of field including an optical unit that includes a first surface and a second surface both centered by an optical axis and opposite to each other. At least one of the first and second surfaces is defined by a superposition of a base sag profile and a feature sag profile and includes in sequence a first zone, a second zone, and a third zone along a radial direc...