| Limiting value of the spectrally weighted source radiance of an ophthalmic instrument which if exceeded, could cause damage at or to the retina. NOTE: The effect of the radiance of a source (see 3.6) will decrease sa the light beam passes through an optical system due to filtering, absorbtion ar other loss mechanism. Thus, basing the retinal hazard on the source radiance ensures that the radiance at the retinal cannot exceed the source radiance. | |  Back |