SINCE the introduction of the photocoagulator by Meyer-Schwickerath (1954), the clinical application of this method has developed rapidly, but there have been relatively few experimental reports on the histological effects of photocoagulation (Nover, 1961; Kissen, Delaney, and Wachtel, 1961). The immediate and long-term histological effects of different intensities of photocoagulation are of gr...