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Optical Zone
Wide Zone = Fewer Problems
The physics of the eye and its optical system create a limit as to how wide and how deep into the eye the laser should ablate. In other words, the wider the ablation, the deeper the laser must ablate into the cornea of the eye.
VISX scientists have worked for years to generate the widest ablation area that also removes the least tissue possible. Currently, the VISX laser performs myopic ablations that are 6.5 millimeters wide. This is among the largest available. Other lasers, notably the Nidek, are approved only to a width of 5.5 millimeters.
For myopia, any optical zone greater than 6.5 millimeters runs the risk of going too deep into the cornea and not leaving enough tissue for proper healing and visual recovery. In fact, patients with high levels of myopia may not be eligible for treatment if the optical zone is above 6.5 millimeters.
Studies have shown that the larger optical zone created by the VISX system helps reduce problems with night vision and other side effects associated with laser vision correction.
VISX scientists believe they have created the best of both worlds when meeting the needs of both ablation "width" and ablation "depth."
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