RÉSUMÉLes propriétés optiques des tissus biologiques conditionnent de manière importante le risque d'atteinte par le faisceau laser. Les rayonnementii, émis dans I'ultraviolet mais aussi l'infrarouge B et C, représentent un danger pour le segment anté-rieur de l'oeil. Selon la longueur d'onde, le rayonnement est absorbé préférentiel-lement ou exclusivement par la cornée ou le cristallin. The risk for biological tissues to be damaged by a laser beam is mainly determined by their optical properties. Laser radiations emitted in ultraviolet and infrared B and C represent a hazard for the anterior segment of the eye. Depending the wavelength, laser radiation is absorbed by the cornea, the lem or hotb. The lower damage thresholds are reported at the retinal level, in the spectral range of 400 to 1400 nm. The exposure limit values, recommended by laser safety standards, are evaluated with wavelength, exposure duration, puise repetition frequency and the size of the visual angle subtending the source. The fast evolution of laser producîs induces a continuous revision of guidelines.
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