Systems and methods for streamlined purchasing are described herein. The blocking film includes at least one kind of group 8 element. The evaluation module is configured to measure polarization dependent loss of an optical signal received at the optical receiver. During writing the selected, simultaneously illuminated, intersection domains change their index of refraction, attendant upon a change in isomeric molecular form, by process of 2-P absorption. The present invention is useful for the prophylaxis andor treatment of cerebral diseases of dementia, amnesia, manic-depressive psychosis, schizophrenia, Parkinson’s disease, psychosomatic disease and the like.