Patent ID: 6761454
Filing Date: 2004-07-13
Classification: A61B

Abstract:
An apparatus for determining the refraction and aberrations of a patient's eye focused on an external physical target, comprising:a light source; optics directing light from said light source to the patient's eye; a test lens having an optical power, said test lens disposable in an optical path between the patient's eye and said external physical target, such that the patient'eye looking at said external physical target receives light from said light source through the lens; at least one wavefront measurement device positioned to detect aberrations in light returning from the patient's eye; a housing containing said optics and said test lens, said housing having an input port and an output port, said optical path between the patient's eye and said physical target passing through said input port into said housing and through said output port thereby exiting said housing, said target being external to said housing; and processing electronics configured to compute variation in multiple wavefront measurements performed by said wavefront measurement device using said test lens having said optical power to measure a patient's subjective response to said optical power.