| 摘要 |
An eye movement tracker for stabilizing an ophthalmic illumination instrument on the fundus has a laser source (10) which produces a narrow directed tracking beam, an optical steering assembly (30, 50) for controllably directing the beam to illuminate a region of the fundus, and means for imaging the illuminated region on a spatially-distributed photo-detecting element (61) A tracking circuit (40) scans the detecting element to detect motion of a spatially variant intensity feature, such as a blood vessel, and controls the optical steering assembly (30, 31, 32) to redirect the optical path and maintain the feature in a fixed position This repositions the diagnostic or other illumination, maintaining it in a fixed position on the fundus during eye movement Scanning rates many times those of conventional systems are achieved, effectively stabilizing even very rapid eye movements. A viewing port (70) provides an operator with a 30 degree field of the subject's eye fundus In a preferred system, light of different wavelengths is used for tracking, for observation and for photo-coagulation subsystems. Filters divide out the spectral component for each subsystem from the common optical path. |
