A system for therapy of the eye by treating tissue by means of nonlinear interaction with therapy radiation (4, 6), the system comprising: - a laser device (3, 5), which provides the therapy radiation (4, 6), - a focusing device, which comprises an image field lying in a therapy volume and which focuses the therapy radiation (4, 6) onto a focus in the image field such that the treatment is producible within the tissue by means of nonlinear interaction, - an xy-scanner device, disposed upstream of the focusing device, for lateral displacement of the focus in the image field, - a z-scanner device (7, 8), which adjusts a depth position of the focus in the therapy volume, and - a control device, which controls the xy-scanner device and the z-scanner device (7, 8), wherein - the laser device (3, 5) provides, as the therapy radiations, a first short-pulse radiation at a first centroid wavelength and a second short-pulse radiation at a second centroid wavelength, which differs from the first centroid wavelength by at least 300 nm, wherein the first short-pulse radiation covers a first wavelength range about the first centroid wavelength due to a pulse length of the first short-pulse radiation and the second short-pulse radiation covers a second wavelength range about the second centroid wavelength due to a pulse length of the second short-pulse radiation, wherein - the system operates either with the first short-pulse radiation or the second short-pulse radiation, characterized in that - the system is configured in respect of longitudinal chromatic aberration and transverse chromatic aberration such that the system has a longitudinal chromatic aberration at at least one of the two centroid wavelengths (30, 31), wherein in both wavelength ranges (30, 31) a spectral characteristic curve of the longitudinal chromatic aberration is constant within a longitudinal chromatic aberration tolerance, which longitudinal chromatic aberration tolerance is in particular not higher than an upper limit of 2 x a depth of focus of the focusing device, and - a wavelength in the first wavelength range is used as reference wavelength for the longitudinal chromatic aberration and the control device is configured to control the z-scanner device (7, 8) such that during operation with the second short-pulse radiation the longitudinal chromatic aberration is compensated by an offset of a depth position of the focus, and/or the system comprises a refocusing element acting only on the second short-pulse radiation or being activated only during operation with the second short-pulse radiation, said refocusing element compensating the longitudinal chromatic aberration by a respective offset of the depth position of the focus. - a laser device (3, 5), which provides the therapy radiation (4, 6), - a focusing device, which comprises an image field lying in a therapy volume and which focuses the therapy radiation (4, 6) onto a focus in the image field such that the treatment is producible within the tissue by means of nonlinear interaction, - an xy-scanner device, disposed upstream of the focusing device, for lateral displacement of the focus in the image field, - a z-scanner device (7, 8), which adjusts a depth position of the focus in the therapy volume, and - a control device, which controls the xy-scanner device and the z-scanner device (7, 8), wherein - the laser device (3, 5) provides, as the therapy radiations, a first short-pulse radiation at a first centroid wavelength and a second short-pulse radiation at a second centroid wavelength, which differs from the first centroid wavelength by at least 300 nm, wherein the first short-pulse radiation covers a first wavelength range about the first centroid wavelength due to a pulse length of the first short-pulse radiation and the second short-pulse radiation covers a second wavelength range about the second centroid wavelength due to a pulse length of the second short-pulse radiation, wherein - the system operates either with the first short-pulse radiation or the second short-pulse radiation, characterized in that - the system is configured in respect of longitudinal chromatic aberration and transverse chromatic aberration such that the system has a longitudinal chromatic aberration at at least one of the two centroid wavelengths (30, 31), wherein in both wavelength ranges (30, 31) a spectral characteristic curve of the longitudinal chromatic aberration is constant within a longitudinal chromatic aberration tolerance, which longitudinal chromatic aberration tolerance is in particular not higher than an upper limit of 2 x a depth of focus of the focusing device, and - a wavelength in the first wavelength range is used as reference wavelength for the longitudinal chromatic aberration and the control device is configured to control the z-scanner device (7, 8) such that during operation with the second short-pulse radiation the longitudinal chromatic aberration is compensated by an offset of a depth position of the focus, and/or the system comprises a refocusing element acting only on the second short-pulse radiation or being activated only during operation with the second short-pulse radiation, said refocusing element compensating the longitudinal chromatic aberration by a respective offset of the depth position of the focus.