Abstract: The present invention is an apparatus for producing and delivering high-intensity light to the eyes of a subject to modify the subject's circadian phase. The apparatus includes a support for positioning the apparatus above the eyes of the subject, a light generator for producing a cool, high-intensity light which is radiated to the eyes of the subject, and a power source coupled to the apparatus for supplying power to the light generator. The support of the invention is preferably a visor which does not obstruct the subject's vision when positioned on the head.

Abstract: A controlled emission of light from an optical waveguide, e.g. a fiber into which light is injected at one end, is effected by modifying the periphery of the waveguide over a generally triangular zone so that there is a controlled emission per unit length at every point along this zone and light emanates continuously over the length of the zone from the fiber.