Patent ID: 8016420
Filing Date: 2011-09-13
Classification: A61B

Abstract:
1. An optical device to diagnose an eye of a patient, the device comprising: a display with a visible target visible to a patient; an optical system to project the visible target along an optical path from the display to the patient, the optical system comprising a lens to provide positive optical power when the visible target is fogged and wherein the display is coupled to the optical system to move the visible target with a movement transverse to the optical path when the visible target is fogged; a sensor coupled to the optical system to measure optical aberrations of the eye; and a processor coupled to the display, the optical system and the sensor, the processor having a computer readable memory with instructions embodied thereon to fog the visible target with the optical system, to decrease a size of the visible target on the display when the visible target is fogged, to move the visible target on the display with the movement transverse to the optical path when the target is fogged, and to measure the optical aberration of the eye with the sensor in response to the decreased size and movement of the visible target transverse to the optical path, wherein the processor has instructions to display a stationary scene having a stationary visible image of an object and to move the visible target along the stationary scene transverse to the optical path when the stationary image is displayed.