Fig. 5. Histologic sections of the foveas of macaque monkeys. With blue light, all retinal layers are destroyed by coagulation; with green light, the inner layers are preserved and the outer layers are destroyed. (Pomerantzeff O, Kaneko H, Donovan R et al: Effect of the ocular media on the main wavelengths of argon laser emission. Invest Opthalmol Vis Sci 15:70, 1976.)