More than 70 percent of LASIK surgeons, including Dr. Whitsett, prefer the VISX STAR S4 laser system and it's Variable Spot Scanning (VSS) and the unique Active Trak three-dimensional eye tracker. More than two million LASIK procedures have been performed on VISX Star system lasers.

In the fall, 2000, a new generation of this laser with Variable Spot Scanning was released that significantly increased the treatment zone by 51% to 8 mm. This has minimized problems related to glares and halos at night.

The Active Trak’s three-dimensional eye tracker is causing the most excitement among the medical community and patients. The Active Trak with its dual side- mounted infrared cameras continuously positions the laser beam precisely on the eye throughout the procedure. Eye position and speed are checked at least six times before every pulse as compared to only 1.7 times per pulse with radar-tracking lasers. The three-dimensional capability that tracks the x, y and z axis means that Active Trak follows not only the left and right movements of the eye; it follows the up and down movements that can happen when one breathes.

The VISX STAR S4's variable beam technology permits smoother treatments with more precise corneal shaping, and removes less tissue, which results in a faster treatment.

The VISX STAR S4 does not require dilation like the LADARVision laser. Dilation makes it more difficult for the surgeon to find the actual center of the eye and causes temporary glare and light sensitivity.

It should be noted the VISX STAR S4 laser system was developed specifically for ophthalmological use, whereas the LADARVision was originally created for military use.

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