A device for introducing light into a human or animal eye, comprising an optical waveguide (1), which has a connection region for coupling to a light source and an operative region (3) for emitting light, said operative region being formed at the free end (2), is characterized in that the operative region (3) is designed at least partly as a piercing or cutting tool, such that the free end (2) can be introduced into the interior of the eye without further aids.
