A method for the transformation of measured values of a characteristic of the cornea and apparatus for measuring the topography of the cornea. The method involves using a parameterized assignment rule, providing a slider as an operating control, determining a current setting of the slider, and determining a parameter of the assignment rule based on the determined setting of the slider. The observer can sift through a large number of variants of the assignment rule within a short time without prior knowledge by means of the slider to extract information at different parameter settings in an economical manner.
