A method and preparation for reducing dry eye symptoms and promoting tear secretion in a subject in need of such treatment is disclosed. The phases of the first and second induced magnetic poles of the outer rotor are displaced from each other by only half of a predetermined pitch, and the phases of the first and second permanent magnets of the inner rotor are displaced from each other by only the predetermined pitch. Via holes are drilled so that heat of the drilling process causes a metallization at the surface of said via holes that renders conductive the semi-conductive layer’s surface of said via holes, thereby establishing series-interconnecting electrical paths between optoelectronic components by connecting first front-contact components to second back-contact electrodes.