Femtosecond Lenticule Extraction (FLEx) for Spherocylindrical Hyperopia Using New Profiles

Abstract

Purpose: To investigate new lenticule profiles for the treatment of hyperopia by femtosecond lenticule extraction (FLEx) for spherocylindrical hyperopia using a modified laser scan sequence.

Methods: In this prospective 9-month study, 39 eyes of 22 patients with the mean age of 49 years (range: 27 to 56 years) underwent hyperopic FLEx. The mean optical zone was 6 mm (range: 5.75 to 6.75 mm) with keratometry readings and magnitude of correction adjusted mean transition zone of 2.1 mm (range: 1.80 to 2.89 mm). The lenticule thickness was set at 25 μm in the center and 10 μm at the edge.

Results: Preoperative spherical equivalent manifest refraction was +1.96 ± 1.04 diopters (D) (range: +0.63 to +4.50 D). Because of the presbyopic age, the treatment was aimed at low myopia in 75% of the eyes treated. At the final 9-month follow-up visit, the mean spherical equivalent was -0.40 ± 0.61 D (range: -1.50 to +0.75 D), with 70% of eyes treated within ±0.50 D and 89% of eyes within ±1.00 D of intended correction. The regression was +0.29 D between 1 week and 6 months but 0.03 D between 6 and 9 months. A total of 10% of eyes lost one line of corrected distance visual acuity, respectively. There were no losses of two or more lines of visual acuity or any serious intraoperative or postoperative complications.

Conclusions: Treatment of spherocylindrical hyperopia by FLEx led to refractive results similar to published outcomes on hyperopic femtosecond laser-assisted LASIK. [J Refract Surg. 2018;34(1):6-10.].