Abstract
Present codes of practice for laser workers contain maximum permissible exposure levels for eye safety. These figures are derived by combining some safety factor with empirically determined figures for threshold damage detected by ophthalmoscopic examination. The present paper re-examines such safety factors by determining the energy correlates for threshold damage using three different techniques. In order of increasing sensitivity these are ophthalmoscopy, fluorescein angiography, and electron microscopy. The sensitivity and statistical reliability of fluorescein angiography are discussed and related both to the mechanisms of laser induced retinal damage, and to the role of angiography in the detection of laser accidents.
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