A method determines an optical property (S, C) of a patient eye with an intraocular lens. The patient eye and the intraocular lens define a system. In the method, a measured value of the optical property of the system is determined at a measurement time (tM) after injecting the intraocular lens into the patient eye. The measured value and the associated measurement time (tM) are compared to a known time profile of the values of the optical property for the lens. The known time profile since unfolding the intraocular lens was determined experimentally before the lens is injected and is made available in the form of measurement series or data derived therefrom. A value for the optical property of the system is determined at a different time than the measurement time (tM), according to the known time profile of the values of the optical property for the lens.
