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Laser scanning trajectory affects outcomes of femtosecond lenticule extraction

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

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Early visual recovery and refractive outcomes after using femtosecond lenticule extraction were affected by the scanning trajectory of the laser, according to a study.

Researchers at New Vision Laser Centers in Vadodara, India, conducted a prospective clinical study to evaluate the results of refractive lenticule extraction using the VisuMax femtosecond laser system (Carl Zeiss Meditec). They performed lenticule extraction using two scanning trajectories to treat refractive errors on 329 eyes of 173 patients.

Outcome measures were corrected and uncorrected distance visual acuities and manifest refraction at 6-month follow-up.

At 1 week postop, 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, no differences were found at final follow-up.

"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 wrote.