The invention relates to an optical anti-dazzle device, more particularly for motor vehicles, with a light receiving component (2) and a light source (3), the light emission of which can be controlled in dependence on the light emission of a source of dazzle. In order to achieve such a relatively large, mainly homogeneously shining surface in such a anti-dazzle device in spite of its compact, flat dimensions, according to the invention the light source (3) is assigned a flat light guide (5) with at least one narrow edge surface (6) and at least one flat light emission surface (10), wherein the light from the light source (3) can be launched via the narrow edge surface (6), and the area of the light emission surface (10) is a multiple of the area of the narrow edge surface used for launching light. Another form of embodiment of the anti-dazzle device according to the invention consists in the light source being formed by a luminous film, which can be activated by an electronic device in such a way that the luminous film forms an essentially homogeneously shining surface. A further embodiment of the anti-dazzle device according to the invention consists in the light source comprising organic light-emitting diodes which are arranged on at least one glass carrier or at least one flexible, transparent carrier made of plastic.