Abstract: The present application relates to a method and a device for preoperatively predicting a postoperative horizontal depth of an intraocular lens in a patient's eye. Parameter values are provided, said parameters including a first parameter as the depth of an anterior chamber of human eyes, a second parameter as a horizontal length of human eyes, and a third parameter as a postoperative position of intraocular lenses in human eyes. Specific triplets of values are selected from said values as main interpolation nodes, each triplet of values comprising a value for each of the three aforementioned parameters, and the main interpolation nodes are entered into a three-dimensional coordinate system that is spanned by the three parameters.