A method for calculating the values of an intraocular lens to be implanted, wherein the results of numerous cataract operations are taken into account in the calculation for intraocular lenses to be implanted in the future. At least the corneal topography, the length of the eye and the depth of the anterior chamber are determined pre-operatively, the values of the IOL to be implanted are calculated by means of ray-tracing, and at least the corneal topography, the length of the eye, the depth of the anterior chamber and the objective, wavefront-based residual refraction are determined post-operatively. The measurement values determined pre-operatively and post-operatively are used to optimize the surgically-induced astigmatism and the post-operative anatomical lens position for calculating the values of IOLs to be implanted in the future.
