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Scanning trajectory may affect early results of femtosecond lenticule extraction

J Cataract Refract Surg. 2011;37(9):1636-1647.

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The scanning trajectory of the laser in femtosecond lenticule extraction may affect early visual recovery and refractive outcomes, according to a study.

A prospective clinical study evaluated the results of refractive lenticule extraction using the VisuMax femtosecond laser system (Carl Zeiss Meditec). The researchers performed lenticule extraction using two scanning trajectories to treat refractive errors on 329 eyes of 173 patients.

Outcome measures were corrected distance visual acuity, uncorrected distance visual acuity and manifest refraction during 6 months of follow up.

One week postoperatively, results showed significant differences in refractive outcomes (P = .03), safety (P < .01) and efficacy (P < .01) between the two groups, according to the study. However, at final follow-up, no differences were found.

"A trajectory that scanned from the periphery to the center and the center to the periphery to cut the two lenticule surfaces had a positive effect on visual recovery," the researchers said.