Patent ID: 8297753

Claim:
A method for determining correction characteristics of a visual aid for at least one eye of a person, said method comprising the steps of: determining a visual impression of the person viewing with the eye under a first usage condition, said visual impression of said person under said first usage condition being determined based on at least one of, a wavefront error measurement and a measurement of a subjective refraction; determining a visual impression of the person viewing with the eye under a second usage condition, said visual impression of said person under said second usage condition being determined based on a wavefront error measurement, said first usage condition differing from said second usage condition as to an amount of light under which said viewing with the eye is carried out; and, determining the correction characteristics of the visual aid such that a point spread function describing a visual impression of the person viewing with the eye visually aided by a visual aid having said correction characteristics under said second usage condition at least approximately matches a point spread function describing a visual impression of the person viewing with the eye visually aided by a visual aid having said correction characteristics under said first usage condition.