3 Months Clinical Outcomes Following Lenticule Extraction Using A Femtosecond Laser Equipped With An Advanced Eye-Tracker In Cases With Low Diopter / Thin Lenticule

To assess the safety, efficacy, and refractive outcomes of lenticule extraction in low diopter myopic patients, both with and without astigmatism, employing a femtosecond laser system equipped with an eye-tracker for precise centration and cyclotorsion compensation.

Muscat Eye Laser Center 

A retrospective analysis was conducted on 50 eyes from 25 patients, with a mean age of 25.7±6.6 years (range: 18–38 years), who underwent lenticule extraction treatments using the SmartSight method with the SCHWIND ATOS femtosecond laser. The manifest refraction of all patients had been in the low diopter range from SEQ less than -3.00 D. The three-month follow-up included a comprehensive assessment of safety, efficacy, and refractive outcomes, focusing on spherical equivalent (SEQ) and cylinder parameters in all cases.

The study comprises 50 eyes. The preop SEQ was -2.4±0.5D [range -1.25 to -3.00D] and the cylinder was ≤2,75D. Lenticule thickness was -76±6.7µm [range 60 to 89µm] using a mean optical zone of 7.0±0.3mm [range 6.3 to 7.3mm]. Three months postop the mean SEQ refraction was -0.02±0.07D (range -0.25 to 0.00D) and the mean cylinder was -0.0±0.0D. The uncorrected distance visual acuity (UDVA) was the same as or better than the CDVA in 100% of the cases. The mean efficacy index was 1.0 and the mean safety index was 1.0. The residual astigmatism was 0.25D or less in all patients. Real lenticule thickness was in average 10µm thinner than planned to result in a thicker post-op cornea as expected.

The data from the 3-month follow-up of low diopter myopic correction reveal rapid visual recovery and precise refraction. SmartSight emerges as an effective and safe procedure for addressing myopia and myopic astigmatism, particularly notable for its efficacy in utilizing large optical zones.