Abstract: A device for treating eyes, the device having a lance-like housing which extends along a longitudinal direction (L) and can be inserted into an area of the eye to be treated. The device further includes at least one cutter element, which is arranged at least partially inside the housing and is movable relative to the housing. The housing has an opening through which the cutter element can contact the area of the eye to be treated. The apparatus preferably includes a drive for generating the movement of the cutter element. The cutter element is configured to be rotatable or pivotable with respect to a predefined axis extending in or oblique to the longitudinal direction (L).

Abstract: A method for operating an optical observation apparatus (1) comprising at least one eyepiece (23), at least one camera (25) and an observation beam path (3) for displaying an object field image (45) is provided. In the method, a superimposition beam path (4) representing an electronically generated superimposition image (43) is superposed onto the observation beam path (3), wherein the observation beam path (3), onto which the superimposition beam path (4) has been superposed, has one eyepiece branch (17) leading to the at least one eyepiece (23) and one camera branch (19) leading to the at least one camera (25). The at least one camera (25) records an image on the basis of the camera branch (19).