A method for adjusting a scanning laser-treatment device to an eye, including: using a laser-treatment device for emitting treatment laser radiation, a handpiece into which the radiation is coupled and having multiple markings and an outlet end for emitting the radiation into the eye, and a laser scanner arranged between a radiation source and the outlet end； using an OCT module with a scanner to image eye structures, the handpiece and the module being movable relative to each other in a first state, and the handpiece coupling to the module to image the eye through the outlet end； imaging the markings and ascertaining a first relative position between the markings and the OCT scanner； imaging an eye structure using the module through the handpiece and outlet end, and ascertaining a second relative position； and generating signals to actuate the laser scanner based on the first and the second relative positions.
