Abstract: The present invention relates to a device for measuring an optical element comprising: a. a light source, b. a measurement structure which illuminated by the light of the light source and has areas of different transmissivity, c. an optical imaging system for converting light transmitted by the measurement structure into a collimated measuring beam which is directed onto the optical element, and d. a sensor for detecting a reflection of the measuring beam generated on the optical element for detecting a transmission of the measuring beam passing through the optical element. According to the invention the light source has a plurality of light segments, wherein the device further comprises a control unit which is designed for independently controlling the plurality of light segments. The invention further relates to a corresponding method for measuring an optical element.

Abstract: The invention relates to a device for measuring panes. The device comprises a light source and a light sensor which are arranged in such a way that a light beam emitted from the light source passes through the pane and impinges on the light sensor. According to the invention, the light beam has a linear polarization, wherein the polarization direction forms an angle of between 50° and 130° with an incidence plane stretching between the axis of the light beam and the pane normal at the point at which the light beam impinges on the pane. The light sensor is dimensioned such that both a primary beam and a secondary beam of the light beam impinge on the light sensor. The invention also relates to a corresponding method. According to the invention, the second beam has an increased brightness, so that it is easier to measure both beams.