Dr. Cheng begins each LASIK procedure by using specialized WaveScan wavefront equipment to create a detailed 3-D map of the patient’s eye. This map reveals minute imperfections unique to each eye, many of which go undetected in traditional laser scans. After preparing the patient’s eye by creating a tiny flap in the cornea, Dr. Cheng uses the 3-D map to precisely program the excimer laser, which reshapes the cornea so that it refracts light rays properly. To further enhance the precision and safety of the LASIK procedure, Dr. Cheng uses ActiveTrak eye tracking technology, which follows the tiny, rapid movements of the eye and adjusts the excimer laser accordingly.