ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,408,832, issued on Sept. 9.
"Vision-testing method and device thereof" was invented by Wei Liu (Shenzhen, China), Junlong Liu (Shenzhen, China), Juntao Liu (Shenzhen, China), Junchao Liu (Shenzhen, China) and Junshuai Liu (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention provides a vision-testing method and vision-testing device. The vision-testing method is applied to the vision-testing device. The vision-testing device includes a light-transmitting apparatus, a plurality of vision test marks arranged on one side of the light-transmitting apparatus, and a plurality of light-emitting units arranged on another side of the lig...