Fig. 8. Histologic sections of the foveas of macaque monkeys. With krypton yellow, the lesion is similar to that produced with argon green. With krypton red, the damage is limited to the level of pigment epithelium. (Pomerantzeff O, Kaneko H, Donovan R et al: Effect of the ocular media on the main wavelengths of argon laser emission. Invest Ophthalmol Vis Sci 15:70, 1976.)