Optical Arrangement and Method

The invention relates to an optical arrangement comprising at least one spatial modulator for light, comprising at least one light source and comprising at least one projection region, it being possible for the spatial modulator to be irradiated by the light from the light source and the projection region being connected downstream of the spatial modulator in the beam path of the light, characterized in that the light source can be at least temporarily modulated and the modulator can be controlled such that at least one portion of the projection region can be irradiated by the modulated light, and in that the optical arrangement comprises at least one sensor, by means of which a change to the modulatable light owing to a body approaching and/or retreating and/or being arranged at or in the portion can be detected. The invention further relates to a method using the optical device.