Circular polarizers, also referred to as circular polarizing filters, can be used to create circularly polarized light or alternatively to selectively absorb or pass clockwise and counter-clockwise circularly polarized light. They are used as polarizing filters in photography to reduce oblique reflections from non-metallic surfaces, and are the lenses of the 3D glasses worn for the viewing of stereoscopic movies that use different directions of polarisation to differentiate the images to be presented to the left and right eye.