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To the Editor:
Reference is made to the article by Curtin et al, "Comparative Histopathology of Cryosurgery and Photocoagulation" which appeared in the May issue of the Archives of Ophthalmology. In comparing visible lesions of minimal to moderate intensity obtained by cryoapplication to those caused by photocoagulation, the authors have done interesting and creditable work. In the latter part of their paper they compare their findings with those obtained with methods of diathermy application which were in general use in 1944. They conclude unfavorably to the use of diathermy.Their conclusion may or may not be correct, but they have in no way established their point. They have failed to mention several rather fundamental differences in the 1944 methods of diathermy application and in the current methods. Today, the electrodes have a much smaller surface of application, perforating electrodes are seldom used, and applications are made on uniformly thinned sclera