Conventional Versus Inverted Side-cut Flaps for Femtosecond Laser-Assisted LASIK: Laboratory and Clinical Evaluation
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AbstractPURPOSE:
To study the differences in early corneal cellular events and biomechanical properties after femtosecond laser-assisted LASIK performed using conventional or inverted side-cut angles.
METHODS:
In the laboratory study, left eyes of 24 rabbits underwent LASIK flap creation with a 70° or 115° side-cut. The contralateral eyes served as controls. The corneas were harvested 24 hours postoperatively. In the clinical study, 2 eyes of each patient (n = 29) were randomized to corneal flap creation with 70° or 115° side-cut angles during LASIK. The Ocular Response Analyzer (ORA; Reichert Ophthalmic Instruments, Depew, NY) was used to assess biomechanical properties of the cornea.
RESULTS:
In rabbit eyes, epithelial ingrowth was observed more frequently in flaps with 70° side cuts compared to flaps with 115° side-cuts. Corneas with 70° side-cuts showed significantly increased apoptotic cells compared to 115° side-cuts in the central (P = .001) and peripheral (P = .004) regions. Fifty-eight eyes of 29 patients were included in the clinical study. An overall reduction in Goldmann-correlated intraocular pressure, corneal-compensated intraocular pressure, corneal resistance factor, corneal hysteresis measurements, p1 area, p2 area, and p1 area 1 and p2 area 1 was noted 37 ± 2 months after surgery (P < .001). No significant difference was observed in the change of any of these parameters between both groups (P ≥ .146).
CONCLUSIONS:
Significant differences in wound healing were observed in rabbit corneas that underwent LASIK with conventional or inverted side-cuts. Variation in flap side-cut angles did not alter the long-term biomechanical properties measured with the ORA in patients after LASIK.
Acceptance Date21/10/2016
All Author(s) ListVishal Jhanji, Tommy C.Y. Chan, Wai Ying L, Rayne R. Lim, Marco C.Y. Yu, Kasin Law, Peng Yi, Yolanda W.Y. Yip, Yumeng Wang, Tsz Kin Ng, Shyam S. Chaurasia, Rajiv R. Mohan
Journal nameJournal of Refractive Surgery
Year2017
Month2
Day15
Volume Number33
Issue Number2
Pages96 - 103
ISSN1081-597X
eISSN1938-2391
LanguagesEnglish-United States

Last updated on 2021-17-01 at 01:34