A new PRBA-based instrument to measure the shape of the cornea

We have developed a prototype-instrument providing a new way to measure the shape of the cornea. Our approach exploits properties of pseudo random binary arrays (PRBAs). Encoded in a coloured pattern (stimulus) that is mirrored to the eye PRBAs allow for unique characterization of positions both in the stimulus and the reflected image. This is used to come to an integral reconstruction of the cornea. It is demonstrated that the new technique contributes to a very robust measurement method.