Note: AEL (accessible emission limit) is the maximum accessible emission level within a particular class. The Class 1 AEL is that radiant power or energy of a laser under consideration such that no applicable exposure limit for exposure of the eye for a specified exposure duration can be exceeded under any possible viewing conditions with or without optical instruments, whether or not the beam is focused. aFrom Technical Bulletin TB MED 524, Department of the Army, Washington, DC, June 1985.