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Aspheric treatment zone algorithm shows good visual results

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BERLIN — A customized aspheric treatment zone provides a safe and effective algorithm for myopic patients with astigmatism undergoing LASIK, according to data from a U.S. Food and Drug Administration study presented here.

At the European Society of Cataract and Refractive Surgeons meeting, George O. Waring III, MD, FACS, FRCOphth, presented multicenter clinical results of the Nidek CXII customized aspheric treatment zone (CATz), examining its use in 135 eyes of 68 patients with manifest refraction sphere from –0.5 D to –7 D with up to –4 D of astigmatism.

Patients had better postoperative uncorrected visual acuity than preoperative best corrected visual acuity, he said. They also reported no driving difficulties at 6 months and fewer problems with light sensitivity, halos, star bursts and glare postop.

Dr. Waring said the topographically guided ablation algorithm creates a more prolate cornea, steeper in the center and flatter moving away from it.

"When we do a standard LASIK or a standard PRK, we create a prolate cornea," he said. "With the transition zone in the CATz algorithm, we have maintained an aspheric transition zone, and we're able to maintain a prolate cornea."