A mirror optic (10) is provided for near-field optical measurement of a specimen (1), wherein the mirror optic (10) has a reflector (11) with the shape of a paraboloid with a paraboloid axis (12) and a focal point (13), which can be illuminated along a first illumination beam path (I), whereby the reflector 11 has at least one edge recess (14) in such a way that the focal point (13) can be illuminated along a second illumination beam path (II) which deviates from the first illumination beam path (I). A near-field microscope with such a mirror optic is also provided.