• A 5.8-gigahertz (GHz) ophthalmic microwave applicator was used to treat choroidal melanoma (Greene strain) in rabbits. High-frequency electromagnetic radiation provides a favorable dose distribution to induce local hyperthermia in the treatment of intraocular tumors. Heating of the neoplasm, while sparing normal ocular structures, is best accomplished by a transscleral approach. A hyperthermia plaque is placed on the sclera at the base of the intraocular tumor. Contact (resistive) heating and electromagnetic radiation (radiofrequency and microwave) are best suited to a plaque technique. The advantages of electromagnetic heat induction, as compared with contact heating, are twofold: the depth of hyperthermic penetration can be modulated by frequency selection, and the tissues with low water content (sclera) remain relatively unaffected by microwaves. The 5.8-GHz ophthalmic microwave applicator satisfies the requirements for local hyperthermic treatment of intraocular tumors.
Finger PT, Packer S, Svitra PP, Paglione RW, Chess J, Albert DM. Hyperthermic Treatment of Intraocular Tumors. Arch Ophthalmol. 1984;102(10):1477-1481. doi:10.1001/archopht.1984.01040031197017