Abstract
Rhesus monkeys were exposed to ocular radiation from the yellow Une, 568.2 nm emitted by a krypton C.W. gas laser to determine the minimal ophthalmoscopic visible damage threshold on the retina. The effective dose 50 per cent probability points were determined for the extramacula sites having an exposure time range of 16–500 msec. Observations of the fundi were made prior to, during, and after each exposure, using a fundus camera. Damage thresholds for krypton were examined and compared to the reported results of helium-neon (632.8 nm), argon (488 nm), and neodymium YAG (1060 nm).
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