ALEXANDRIA, Va., July 7 -- United States Patent no. 12,672,773, issued on July 7.
"Astigmatism testing apparatus and method of use" was invented by Alexander Plekhanov (Portland, Ore.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A subjective refractor apparatus for astigmatism testing allowing observation along an optical observation axis with an optical vision correction of variable power. The apparatus allows a patient's use of a tactile input device to control the rotary movement of rotatable optical elements with cylindrical power, varying the angular position of the optical elements to adjust the total cylindrical power and orientation of the cylinder axis of the resulting optical system. The tactile ...