APPARATUS AND METHOD FOR TRACKING AND COMPENSATING FOR EYE MOVEMENTS

摘要

A system for facilitating tracking of a moving object is disclosed. The object has a feature associated therewith which is illuminated with ambient light. The system includes illumination means for illuminating at least the feature of the object with a tracking light. The system also includes detection means for detecting an image of the feature and for outputting signals corresponding to movement of the image. The signals have a first component due to the tracking light and a second component due to the ambient light. Further, the system includes filter means for filtering the second component from the signals and for outputting the first component of the signals so that the ambient light is discriminated from the tracking light and the moving object can be tracked using the first component of the signals. In one embodiment, in which the object is a human eye, the system may also include logic means for receiving the signals and for generating tracking signals based thereon and means for directing a laser beam upon the eye based on the tracking signals to maintain a substantially centered condition between the optical axis of the laser beam and the visual axis of the eye.