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Do not rely on eye tracking systems alone, ophthalmologist says

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LISBON, Portugal — Monitoring the patient and ensuring proper light fixation during refractive surgery are still important for proper centration, despite advances in eye tracking systems, one surgeon said here.

“Perfect stabilization is impossible,” Ahmed Osman, MD, told attendees at the European Society of Cataract and Refractive Surgeons meeting.

Dr. Osman presented a study comparing tracker-assisted and manual ablation zone centration in 180 eyes. He performed LASIK for myopia and myopic astigmatism in two groups. Group 1 included 120 eyes of 60 patients who underwent LASIK using tracker-assisted ablation with the Asclepion-Meditec MEL-70 G-scan flying-spot excimer laser or the Visx Star S4 IR laser. Group 2 included 60 eyes of 30 myopic patients treated with the Nidek EC-5000 laser without an eye tracker.

The mean decentration was similar in the two groups: In group 1 it was 0.57 mm; in group 2, 0.52 mm. Decentration was found to be more common in patients with high myopia, he said.

“Eye tracking systems are important for centration, but we should not rely on them alone,” Dr. Osman said.