Eye and contact lens movement measurement.

An accurate and relatively simple method of measuring eye and contact lens movement has been developed. A hidden ultra-high-speed motion picture camera, a digital film data analyzer, and computer data reduction are used to define and separate eye, head, and contact lens movements. The technique has an eye rotational accuracy of about 0.2 degrees and a linear translational accuracy of better than 0.05 mm over a field of view of more than 60 degrees. This procedure requires no extraneous hardware, fixtures, or eye restraints, so data can be obtained in a natural environment. It provides a method of evaluating motility training procedures, studying contact lens fitting methods, and investigating tear pumping mechanisms.