System for treating and/or diagnosing an eye of a patient, comprising - a plurality of appliances (1, 2) for treatment or diagnosis on the eye, and - means for logistically linking the appliances to one another, namely - apparatuses for spatial positioning of the appliances relative to one another, - arrangements for positioning the patient and the eye to be treated relative to the individual appliances, - devices for controlled supply of the appliances with energy and auxiliary energy, and/or - communication means for transferring information or control commands between the aforementioned appliances, apparatuses, arrangements and devices, and for outputting information, wherein a common main body for receiving the appliances and holding apparatuses for fastening the appliances to the main body are provided, wherein - a patient-bearing device for the patient and means for forced guidance and positional changes of the patient-bearing device are present for positioning the patient relative to the appliances, wherein - the eye of the patient to be treated is situated, in a first preferred position, in the treatment range of an upstream appliance for producing a flap incision in the surface of the cornea, - the eye of the patient to be treated is situated, in a second preferred position, in the treatment range of a downstream appliance for processing the cornea by ablation, - and wherein devices for recognizing the position of and/or stopping the patient-bearing device at the preferred positions are provided as components of the communication means, characterized in that the positional change - is brought about by movement along a circular path, wherein the preferred positions are positions on the circular path, or - by a rotational movement of the patient-bearing device about an axis of rotation which is arranged between the centre and foot end of the patient-bearing device. - a plurality of appliances (1, 2) for treatment or diagnosis on the eye, and - means for logistically linking the appliances to one another, namely - apparatuses for spatial positioning of the appliances relative to one another, - arrangements for positioning the patient and the eye to be treated relative to the individual appliances, - devices for controlled supply of the appliances with energy and auxiliary energy, and/or - communication means for transferring information or control commands between the aforementioned appliances, apparatuses, arrangements and devices, and for outputting information, - apparatuses for spatial positioning of the appliances relative to one another, - arrangements for positioning the patient and the eye to be treated relative to the individual appliances, - devices for controlled supply of the appliances with energy and auxiliary energy, and/or - communication means for transferring information or control commands between the aforementioned appliances, apparatuses, arrangements and devices, and for outputting information, - a patient-bearing device for the patient and means for forced guidance and positional changes of the patient-bearing device are present for positioning the patient relative to the appliances, wherein - the eye of the patient to be treated is situated, in a first preferred position, in the treatment range of an upstream appliance for producing a flap incision in the surface of the cornea, - the eye of the patient to be treated is situated, in a second preferred position, in the treatment range of a downstream appliance for processing the cornea by ablation, - and wherein devices for recognizing the position of and/or stopping the patient-bearing device at the preferred positions are provided as components of the communication means, - is brought about by movement along a circular path, wherein the preferred positions are positions on the circular path, or - by a rotational movement of the patient-bearing device about an axis of rotation which is arranged between the centre and foot end of the patient-bearing device.