Abstract
The scanning spot delivery and “laser radar” eye tracking of the LADARVision system is unique among previously used lasers for the above indications. The spot diameter of less than 0.9 mm with a pulse energy of 2.0 to 2.4 mJ is among the smallest in beam diameter and the highest in energy density. Several hundred to a few thousand pulses are required for a typical treatment. At a pulse frequency of 55 to 60 Hz, the treatment time for hyperopia and hyperopic astigmatism is only 17 seconds per diopter. The LADARVision tracking system (laser radar) is essential for accurate spot placement and is required during the laser ablation. The very fast detection frequency of 4000 Hz is more than an order of magnitude greater than in other video camera-based trackers.1 This leads to a response of less than 3 msec rise time, which is more than an order of magnitude faster as well. This very fast eye tracking is necessary to follow fixation-related saccades adequately. The following can occur 5 times/second with a magnitude of up to 1 mm and a speed of 100 mm per second.
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