ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,471,772, issued on Nov. 18, was assigned to Carl Zeiss Vision International GmbH (Aalen, Germany).
"Determining a refractive error of an eye" was invented by Alexander Leube (Aalen, Germany), Arne Ohlendorf (Tubingen, Germany) and Siegfried Wahl (Donzdorf, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method, a device, and a computer program for determining a refractive error of at least one eye of a user are disclosed, as well as a method for producing a spectacles lens for the user. The method includes: displaying at least one symbol on a screen, wherein at least one parameter of the symbol displayed on the screen is changed; detecting eye ...