Infrared radiation and microwaves
The major mechanism of toxicity of infrared radiation and microwaves is the production of heat in tissues. Infrared-A (wavelength 0.8–1.4 micrometres) penetrates the skin, causing burns and pigmentation. Infrared-A also penetrates the liquid content of the eye to reach the retina and can therefore produce damage to all parts of the eye. In contrast, infrared-B and infrared-C (wavelength 1.4–3,000 micrometres) are almost completely absorbed by the superficial layers of the skin and eyes, and the damage is thus confined to the surface. Microwaves (wavelength 1 millimetre to 1 metre) produce heat in tissues.
Because testes and eyes do not dissipate heat well, due to low blood flow through these organs, temporary sterility and cataracts can be produced by microwaves.
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http://www.britannica.com/EBchecked/topic/466463/poison/28150/Nonionizing-radiation#ref396687