A method for the simultaneous measurement of the anterior and posterior corneal surfaces, corneal thickness, and optical aberrations of the eye. The method employs direct measurements and ray tracing to provide a wide range of measurements for use by the ophthalmic community....http://www.google.com.au/patents/US6234631?utm_source=gb-gplus-sharePatent US6234631 - Combination advanced corneal topography/wave front aberration measurement
