[Diathermy procedures, light and laser coagulation, cryocoagulation. Experimental and clinical considerations].

The clinical and experimental results from the methods of coagulation currently in use are presented. The advantages and disadvantages of trans-scleral methods (diathermy and cryopexy) and trans-ocular methods (Xenon arc and argon laser) are discussed. Experiments on absorption, the mode of action of intense light, the optimal time and method of application, the necessary intensity and the extent of the coagulated area are communicated. Of the trans-scleral methods, cryopexy is to be prefered. The trans-ocular methods have the advantage of a more exact localisation and dosage. Either route can often be chosen in any particular case, though at present no overriding advantage has been shown for either.