Korean J Ophthalmol > Epub ahead of print
DOI: https://doi.org/10.3341/kjo.2021.0154    [Epub ahead of print]
Published online January 24, 2022.
The impact of learning curve on flap thickness outcome in femtosecond laser assisted LASIK performed with new LenSx dual platform
Bilgehan Sezgin Asena1, Oya Donmez2
1Department of Ophthalmology, Kaskaloglu Eye Hospital, Izmir, TURKEY
2Department of Ophthalmology, Tinaztepe Galen Hospital, Izmir, TURKEY
Correspondence:  Bilgehan Sezgin Asena, Tel: +90 (532) 3200898, Fax: +90 (232) 4650506, 
Email: drbsezgin@yahoo.com
Received: 9 September 2021   • Revised: 25 December 2021   • Accepted: 30 December 2021
Abstract
Background
To evaluate the effect of learning curve on flap thickness outcome in femtosecond (FS) laser assisted LASIK operation for myopia performed with recently introduced LenSx dual platform using curved applanation cone.
Methods
Seventy eyes of 36 patients with myopia or myopic astigmatism operated with FS laser-assisted LASIK with recently introduced LenSx dual platform were evaluated in this retrospective study. Operations were divided into two groups including first-20 operations (20 eyes of 10 patients) and next-50 operations (50 eyes of 26 patients). Data on patient demographics, preoperative and postoperative keratometric and aberrometric parameters and flap thickness related outcome including mean central flap thickness (MCFT), mean total flap thickness (MTFT), intra-FT range and flap thickness homogeneity (FTH) were compared in study groups.
Result
s: Except for significantly lower preoperative steepest keratometry (K2) values in the next-50 operations vs. first-20 operations (p=0.033), no significant difference was noted between study groups in terms of preoperative and postoperative parameters. When compared to first-20 operations, next-50 operations were associated with significantly higher values for MCFT (median 123 vs. 114 µm, p=0.007) and MTFT (median 123 vs. 113 µm, p=0.015), whereas significantly lower intra-FT range (median 4.0 vs. 4.5 µm, p=0.003).
Conclusions
In conclusion, our findings related to FS laser assisted LASIK surgery for myopia with new LenSx dual platform using curved applanation cone revealed significant impact of learning curve on the corneal flap thickness outcome in terms of closer flap thickness to the intended value and lower intra-flap range.
Key Words: flap thickness, LASIK , learning curve; LenSx
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