Abstract: A process and device for the quantifiable assessment of the physiological impression of reflective surfaces using a point source of light, whose light reflected by the measured surfaces is captured by a photodetector. A series of measured surface values are derived from these measured brightness values for a number of measuring points, which have an exactly defined separation, for which a number of preceding and following measured brightness values are each taken into consideration. The wavelength of the surface disturbances can thereby be determined and analyzed. At least one quality index is derived from the determined measured surface values for the evaluation of the respective surface. The device can be constructed as a hand-held device and moved manually over the surface being tested. For this purpose, the device has at least one measuring wheel, which is rotated by the contact with the surface and whose rotational movement is used to determine the individual measuring points.