1. A method for treating glaucoma in an eye of a patient, the method comprising: providing a combined system comprising a surgical microscope, an OCT apparatus, and a laser treatment apparatus; imaging a part of the eye onto a spatially resolving detector using the surgical microscope of the combined system; recording an image of the part of the eye detected by the spatially resolving detector; storing the recorded image in a storage device; processing the stored image using an image processing device, wherein processing the stored image comprises: identifying a distinguishable anatomical structure of an anterior portion of the eye in the recorded image; and predicting a volume portion of the anterior portion of the eye based on the identified anatomical structure; then acquiring a first OCT-image of the predicted volume portion of the anterior portion of the eye using the OCT apparatus of the combined system, wherein acquiring the first OCT-image comprises: selecting, based on the predicted volume, a scanning path extending within the predicted volume portion of the anterior portion of the eye; scanning an OCT measuring beam along the scanning path; recording OCT data corresponding to the scanning path; and generating the first OCT-image based on the recorded OCT data, wherein the first OCT-image is three-dimensional; and treating the volume portion using the laser treatment apparatus of the combined system to direct a laser beam to the volume portion to modify material in the predicted volume portion of the anterior portion of the eye based on the first OCT-image.