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Femtosecond LASIK flaps yield stable refractive outcomes at 3 months
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A femtosecond laser system yielded predictable LASIK flap creation and reliable outcomes at 3 months, according to a study.
The retrospective case series included 431 eyes of patients who underwent LASIK; 378 eyes were myopic and 53 eyes were hyperopic.
The WaveLight FS200 femtosecond laser (Alcon) was used to create all LASIK flaps. The WaveLight EX500 excimer laser was used to perform the ablation in all cases. Primary outcome measures were postoperative flap thickness and refraction at 3 months.
Study results showed that when the intended flap thickness was 120 µm, mean actual postoperative flap thickness was 120.23 µm.
Among eyes with preoperative myopia, 91.4% achieved an uncorrected distance visual acuity of 20/25, and 83.4% achieved 20/20 at 3 months. Corrected distance visual acuity was better than 20/20 in 93.9% of these eyes. Further, 91% of eyes were within 0.5 D of the targeted refraction. Postoperative refractive astigmatism was lower than 0.25 D in 72% of eyes and lower than 0.5 D in 16.9%.
Among eyes with preoperative hyperopia, uncorrected distance visual acuity was better than 20/25 in 57.1% of eyes and better than 20/20 in 46.4% at 3 months. Corrected distance visual acuity was better than 20/25 in 94.3% of eyes and better than 20/20 in 81.1%, the authors said.
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