Ophthalmic operation microscope system (100, 300) comprising: - an operation microscope (101, 402); - a support apparatus, in which operation microscope (101, 402) is held in a height-adjustable manner so as to be able to set a working distance between the operation microscope (101, 402) and a patient's eye (120, 400); - a first drive for adjusting the height of the operation microscope (101, 402); - an ophthalmoscopy attachment module (114, 401) which comprises an adjustable ophthalmoscopy magnifier (116, 406) so as to be able to set a distance between ophthalmoscopy magnifier (116, 406) and operation microscope (101, 402); - a second drive for adjusting the ophthalmoscopy magnifier (116, 406); - a drive coupling (123, 301) which couples the first drive for adjusting the height of the operation microscope (101, 402) with the second drive for adjusting the ophthalmoscopy magnifier (116, 406), characterized in that the drive coupling (123, 301) couples the first drive for adjusting the height of the operation microscope (101, 402) with the second drive for adjusting the ophthalmoscopy magnifier (116, 306) in such a way that operation microscope (101, 402) and ophthalmoscopy magnifier (116, 306) are movable simultaneously in opposite directions, wherein the drive coupling (123, 301) couples the first drive for adjusting the height of the operation microscope (101, 402) with the second drive for adjusting the ophthalmoscopy magnifier (116, 406) with a non-linear dependence so that the instrument pupil of the system of operation microscope (101, 302) and ophthalmoscopy magnifier (116, 406) is fixed in space when adjusting the operation microscope (101, 402) and ophthalmoscopy attachment module (114, 401). - an operation microscope (101, 402); - a support apparatus, in which operation microscope (101, 402) is held in a height-adjustable manner so as to be able to set a working distance between the operation microscope (101, 402) and a patient's eye (120, 400); - a first drive for adjusting the height of the operation microscope (101, 402); - an ophthalmoscopy attachment module (114, 401) which comprises an adjustable ophthalmoscopy magnifier (116, 406) so as to be able to set a distance between ophthalmoscopy magnifier (116, 406) and operation microscope (101, 402); - a second drive for adjusting the ophthalmoscopy magnifier (116, 406); - a drive coupling (123, 301) which couples the first drive for adjusting the height of the operation microscope (101, 402) with the second drive for adjusting the ophthalmoscopy magnifier (116, 406), characterized in that the drive coupling (123, 301) couples the first drive for adjusting the height of the operation microscope (101, 402) with the second drive for adjusting the ophthalmoscopy magnifier (116, 306) in such a way that operation microscope (101, 402) and ophthalmoscopy magnifier (116, 306) are movable simultaneously in opposite directions, wherein the drive coupling (123, 301) couples the first drive for adjusting the height of the operation microscope (101, 402) with the second drive for adjusting the ophthalmoscopy magnifier (116, 406) with a non-linear dependence so that the instrument pupil of the system of operation microscope (101, 302) and ophthalmoscopy magnifier (116, 406) is fixed in space when adjusting the operation microscope (101, 402) and ophthalmoscopy attachment module (114, 401).