A microscope for ophthalmologic surgery according to an embodiment comprises: an optical system that photographs a patients eye a main body part that stores at least part of the optical system an attachment that is attached to the main body part and has multiple bright points arranged in a ring a determination part that determines whether the eyelids of the patients eye are open or closed by determining whether or not bright point images are depicted within a prescribed region in the frame of a first image obtained by using the optical system to photograph the patients eye while the multiple bright points are projected thereto and a calculation part that calculates astigmatism information of the patients eye based on a second image obtained by using the optical system to photograph the patients eye while the multiple bright points are projected thereto.
