ALEXANDRIA, Va., April 21 -- United States Patent no. 12,607,878, issued on April 21, was assigned to Jiangsu Conant Optical Co. Ltd (Nantong, China).
"Myopia prevention and control spectacle lens" was invented by Qingbo Yan (Nantong, China) and Chuanbao Wang (Nantong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a myopia prevention and control spectacle lens, including a lens body, wherein the lens body is provided with four regions including a first region for providing refractive power, a second region for inhibiting myopia development, and a third region and a fourth region for providing a progressive diopter variation. The first region has a function of focusing an image on a retina...