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[Experimental rationale for a transscleral approach to thermotherapy for intraocular tumors, by using a photosensitizer].

The authors present the results of an experimental study of the pattern of distribution of laser radiation at a wavelength of 810 nm in the normal and Photosens-photosensitized eye tissues and analyze the distribution of a temperature at the sclera/choroidea/ tumor border during transscleral radiation delivery. To further the goal, the authors have resorted to computer mathematical simulation. In convergent-beam radiation supply, the proportion of a scattered radiation component has been ascertained to be lower in the surface scleral layer than that in the layers adjacent to the choroidea and the base of a tumor. On entering the sclera, a splash of light decreases and power density and radiation-induced heating of the deeply located tissues increase. Thus, the major hyperthermic effects show themselves in the tumor rather than on the sclera.