VISX Star S4 Excimer Laser The VISX STAR™ platform's heritage of dependability and performance is well known. The STAR S4 from VISX has a faster chair, automatic alignment for both eyes, horizontal alignment capability, multiple treatments, Variable Spot Scanning, and 3D ActiveTrak. Our VISX Star S4 excimer laser has state of the art technology in optics, precision eye tracking, and sophisticated variable beam delivery combining to provide the most predictable precise laser vision correction possible. The S4 laser includes the latest updates in hardware and software, making sure every available improvement is implemented to expand the laser's capabilities and accuracy. The VISX Star S4 excimer laser removes the smallest amount of corneal tissue of any laser available. This gives shorter treatment times and greater flexibility to personalize the laser treatment resulting in precise consistently accurate outcomes every time.