Vision Testers Manufacturers

Vision tester is an instrument used to test certain visual functions of near and far viewing distances. It encompasses a slide projector for projecting a visual indication chart onto a curved display screen through a mirror rotated by a motor. The center of curvature of the curved display screen substantially coincides with the subject's eye. The rotation of the mirror causes an image of the visual indicator to be moved across the screen in a specific direction. When the subject provides a response to the moving image, the speed of image movement at the time of the response is detected and stored in a memory. The average of a plurality of such measurements is used to determine the subject's dynamic visual acuity.