Method for optically measuring an object with a reflective and/or partially reflective surface, wherein there is produced by means of a pattern generator a flat pattern which is varied in terms of at least one optical property in such a manner that at least in part-regions a large number of different points (p) or a large number of different groups of points can be distinguished from each other, wherein at least portions of the pattern are reflected by a reflective surface of the object as a reflected pattern onto a detector of a camera unit, wherein the reflected pattern is converted by means of the detector into a camera image, wherein a relationship between points (q) of the camera image and corresponding points (p) of the pattern can be described by means of a correspondence function which is dependent on geometric properties of the reflective surface of the object, characterised in that at least one of the geometric properties of the reflective surface of the object is established by using differential geometric properties of a transformation provided by the correspondence function by means of a calculation unit, wherein the correspondence function is derived at least once locally and, from a consideration of the correspondence function and the derivative(s) thereof, information items relating to the geometric nature of the reflective surface are obtained, and in that, when parameters of the correspondence function are calculated and/or when differential geometric properties of a transformation provided by the correspondence function for a point (q) of the camera image are calculated, a neighbourhood of this point is used in the camera image. wherein there is produced by means of a pattern generator a flat pattern which is varied in terms of at least one optical property in such a manner that at least in part-regions a large number of different points (p) or a large number of different groups of points can be distinguished from each other, wherein at least portions of the pattern are reflected by a reflective surface of the object as a reflected pattern onto a detector of a camera unit, wherein the reflected pattern is converted by means of the detector into a camera image, wherein a relationship between points (q) of the camera image and corresponding points (p) of the pattern can be described by means of a correspondence function which is dependent on geometric properties of the reflective surface of the object, characterised in that at least one of the geometric properties of the reflective surface of the object is established by using differential geometric properties of a transformation provided by the correspondence function by means of a calculation unit, wherein the correspondence function is derived at least once locally and, from a consideration of the correspondence function and the derivative(s) thereof, information items relating to the geometric nature of the reflective surface are obtained, and in that, when parameters of the correspondence function are calculated and/or when differential geometric properties of a transformation provided by the correspondence function for a point (q) of the camera image are calculated, a neighbourhood of this point is used in the camera image.