Abstract: An interchangeable optical module (1) for a microscopic or an endoscopic apparatus, in particular for a fluorescence microscope, includes at least one optical element (2), such as a beam-splitter (3), at least one beam path (B1, B2), in which the at least one optical element (2) is arranged, and at least one optical filter (5) which is arranged in the at least one beam path (B1, B2). A microscopic apparatus includes at least one receptacle for receiving at least one interchangeable optical module (1) as stated above. In order to allow different measurement techniques in one apparatus and to easily change the setup, it is intended that the optical module (1) further includes at least one refractive element (7) which is arranged in the at least one beam path (B1, B2).