VISX Iris Registration, the latest in vision precision, fully automated way to accurately align and register wavefront correction for Custom Vue treatments. Using a sophisticated set of algorithms, the fine-step, touch free VISX iris Registration technology helps center treatment independent of changes in the pupil center from the initial measurement. The innovative method not only replaces the time-sensitive manual ink marks Dr.Cheng used to make on the whites of the eyes, but allows the flexible, highly accurate re-registration even if the treatment is paused or the eyes moves.