A method and a device for ascertaining and mapping data representing the optical imaging properties of an eye of a person, in which n different test images are displayed individually in succession on an electronically controllable monitor unit, are seen by the person from a settable viewing angle and at a settable distance, and are identified by means of an input comprising: a) ascertaining a characteristic viewing angle value at a given distance, at which a first probability for correct identification of the test images is achieved, b) ascertaining a characteristic distance value while maintaining the ascertained characteristic viewing angle value, at which a second probability for correct identification is achieved which is greater than the first probability, c) repeating steps a) and b).
