Patent ID: 7758189
Filing Date: 2010-07-20
Classification: A61B,A61F,G01B,G01S

Abstract:
1. An apparatus comprising: a first module to track a reference feature of a retina of an eye; an second module comprising: a source for an imaging beam; a scanning device to move the imaging beam along a portion of the retina of the eye; and a first detection device to receive a signal associated with an image of the portion of the retina scanned, the first module controlling the position of the imaging beam relative to the reference feature to correct for motion of the eye; and a third module comprising: a wavefront sensor to detect an optical distortion; and a wavefront compensator to correct for the optical distortion in the imaging beam scanned on the retina of the eye, wherein the first module comprises: a dithering device for dithering a tracking beam in a first and second direction with an oscillatory motion having a first and second phase, respectively; a first tracking device for controlling the position of a beam relative to a target and for controlling the position of the tracking beam relative to the reference feature, the first tracking device including a first input for accepting a first direction control signal and a second input for accepting a second direction control signal, the first and second direction control signals causing the first tracking device to move the beam in the first and second direction, respectively; a second tracking device for controlling the position of the imaging beam relative to a target, the second tracking device including a first input for accepting a first direction control signal and a second input for accepting a second direction control signal, causing the second tracking device to move at least one of an imaging, therapeutic, and stimulus beam in the first and second direction, respectively; a reflectometer providing an output signal with a phase corresponding to a phase of the reflected tracking beam; a signal processor for comparing the phase of the reflectometer output signal to the phases of the oscillatory motion in the first and second directions, the signal processor generating: the first and the second direction control signals which are coupled to the first and second inputs of the first tracking device, the first and second direction control signals which are coupled to the first and second inputs of the second tracking device; and wherein the first and second direction control signals to the first tracking device, cause the beam to track relative to the reference feature and the first and second direction control signals to the second tracking device cause the imaging beam to track relative to the reference feature.