The argon laser energy necessary to create a threshold visible retinal coagulation in rabbits and monkeys after a one-hour observation period has been calculated utilizing a 50% P histogram. Energies required during 2, 4, 10, and 20 second exposure intervals or image diameters of 105μ (monkeys) and 115μ (rabbits) were determined and the implications discussed.
L'Esperance FA, Kelly GR. The Threshold of the Retina to Damage by Argon Laser Radiation. Arch Ophthalmol. 1969;81(4):583-588. doi:10.1001/archopht.1969.00990010585022