Laser therapy system for treatment of a sclera and/or conjunctiva of a living eye, comprising: a) a dispenser for dispensing an agent on the sclera and conjunctiva, the agent containing a photosensitizer and mediating a collagen and elastin crosslinking for a growth of a collagen tissue structure in a targeted manner during a treatment with a UVA light; b) an imaging unit for 3D imaging of the sclera and/or conjunctiva within an imaging volume, outputting image data; c) an image processing unit adapted to receive the image data, to recognize the collagen tissue structure and to determine a thickness of said collagen tissue structure as a function of a position; d) a UVA light source which is controllable and generates the UVA light with a first wavelength adapted to the photosensitizer and the crosslinking; e) a second light source which is a Laser light source and is controllable and generates a second light with a second wavelength adapted to be absorbed mainly by varicose blood vessels and end-arterioles; f) an optical system adapted to the imaging unit, to the UVA and the second light source, with an aperture as an outlet for the UVA and the second light and as an inlet for the light from the imaging volume to the imaging unit, and providing controllable deflection and focusing means deflecting and focusing the UVA light and the second light on a focus point behind the aperture, wherein said focus point is controllably positionable within the imaging volume; and g) a processing and control unit adapted - to determine a target thickness for the thickness as another function of the position and to determine a thickness deviation as a difference between the target thickness and the thickness; - to determine a pattern for an application of a local UVA light energy, wherein said pattern is described by the focus point in the sclera and/or conjunctiva; - to determine the UVA light energy as a further function of the position, of the thickness deviation, the pattern and a growth factor for the thickness, such that the application of the UVA light energy is assumed to effect the growth of the collagen tissue structure until the target thickness is achieved; and - to control the optical system, the UVA light source and the second light source, such that the UVA light energy and the second light energy or intensity are applied to the sclera and/or conjunctiva as determined. a) a dispenser for dispensing an agent on the sclera and conjunctiva, the agent containing a photosensitizer and mediating a collagen and elastin crosslinking for a growth of a collagen tissue structure in a targeted manner during a treatment with a UVA light; b) an imaging unit for 3D imaging of the sclera and/or conjunctiva within an imaging volume, outputting image data; c) an image processing unit adapted to receive the image data, to recognize the collagen tissue structure and to determine a thickness of said collagen tissue structure as a function of a position; d) a UVA light source which is controllable and generates the UVA light with a first wavelength adapted to the photosensitizer and the crosslinking; e) a second light source which is a Laser light source and is controllable and generates a second light with a second wavelength adapted to be absorbed mainly by varicose blood vessels and end-arterioles; f) an optical system adapted to the imaging unit, to the UVA and the second light source, with an aperture as an outlet for the UVA and the second light and as an inlet for the light from the imaging volume to the imaging unit, and providing controllable deflection and focusing means deflecting and focusing the UVA light and the second light on a focus point behind the aperture, wherein said focus point is controllably positionable within the imaging volume; and g) a processing and control unit adapted - to determine a target thickness for the thickness as another function of the position and to determine a thickness deviation as a difference between the target thickness and the thickness; - to determine a pattern for an application of a local UVA light energy, wherein said pattern is described by the focus point in the sclera and/or conjunctiva; - to determine the UVA light energy as a further function of the position, of the thickness deviation, the pattern and a growth factor for the thickness, such that the application of the UVA light energy is assumed to effect the growth of the collagen tissue structure until the target thickness is achieved; and - to control the optical system, the UVA light source and the second light source, such that the UVA light energy and the second light energy or intensity are applied to the sclera and/or conjunctiva as determined. - to determine a target thickness for the thickness as another function of the position and to determine a thickness deviation as a difference between the target thickness and the thickness; - to determine a pattern for an application of a local UVA light energy, wherein said pattern is described by the focus point in the sclera and/or conjunctiva; - to determine the UVA light energy as a further function of the position, of the thickness deviation, the pattern and a growth factor for the thickness, such that the application of the UVA light energy is assumed to effect the growth of the collagen tissue structure until the target thickness is achieved; and - to control the optical system, the UVA light source and the second light source, such that the UVA light energy and the second light energy or intensity are applied to the sclera and/or conjunctiva as determined.