Ophthalmological radiation system, comprising: a. at least one source of radiation, which emits electromagnetic radiation in the range from 300 nm to 800 nm for irradiating the tissue to be treated, in which a photosensitiser is introduced into the tissue to be treated, and in which the electromagnetic radiation causes photochemical and/or photophysical effects in the tissue, b. an optical system with at least two lenses (2, 4) and a beam splitter, in order to direct the radiation onto the tissue to be irradiated at a preset distance, c. at least one aperture, which is designed and arranged so that together with the optical system it produces an irradiation area on the tissue, on which the electromagnetic radiation of the at least one source of radiation is focused, in which the at least one aperture may be controlled, in order to adjust the irradiation area, d. an electrical power supply for supplying power to the at least one source of radiation, e. a stand for supporting an irradiation unit, which contains at least the components indicated in characteristics a., b., c., with reference to the tissue to be irradiated, in which the stand allows the distance between the irradiation unit and the tissue to be treated to be set, f. an interface or an input device for data to be input by a user with reference to details of the treatment of the tissue with the photosensitiser, g. a control for controlling or regulating the at least one source of radiation using the data input with reference to details of the treatment of the tissue with the photosensitiser, and h. a display device for displaying treatment parameters with reference to the treatment of the tissue with the photosensitiser. a. at least one source of radiation, which emits electromagnetic radiation in the range from 300 nm to 800 nm for irradiating the tissue to be treated, in which a photosensitiser is introduced into the tissue to be treated, and in which the electromagnetic radiation causes photochemical and/or photophysical effects in the tissue, b. an optical system with at least two lenses (2, 4) and a beam splitter, in order to direct the radiation onto the tissue to be irradiated at a preset distance, c. at least one aperture, which is designed and arranged so that together with the optical system it produces an irradiation area on the tissue, on which the electromagnetic radiation of the at least one source of radiation is focused, in which the at least one aperture may be controlled, in order to adjust the irradiation area, d. an electrical power supply for supplying power to the at least one source of radiation, e. a stand for supporting an irradiation unit, which contains at least the components indicated in characteristics a., b., c., with reference to the tissue to be irradiated, in which the stand allows the distance between the irradiation unit and the tissue to be treated to be set, f. an interface or an input device for data to be input by a user with reference to details of the treatment of the tissue with the photosensitiser, g. a control for controlling or regulating the at least one source of radiation using the data input with reference to details of the treatment of the tissue with the photosensitiser, and h. a display device for displaying treatment parameters with reference to the treatment of the tissue with the photosensitiser.