The MP-3S is a microperimeter equipped with a 3D tracking system of the eye and a non-mydriatic fundus camera used to perform microperimetry, to assess the sensibility of photoreceptor cells of the retina. The range of light intensities, from 0 to 34 dB in photopic/mesopic and from 0 to 24 dBin scotopic and the max. luminance of stimuli at 10,000 abs makes possible detecting the lowest sensibilities.