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Comparison of laser in situ keratomileusis flaps created by 3 femtosecond lasers and a microkeratome

 Hyunseok Ahn  ;  Jin-Kook Kim  ;  Chang Kook Kim  ;  Gyu Heon Han  ;  Kyoung Yul Seo  ;  Eung Kweon Kim  ;  Tae-im Kim 
 Journal of Cataract and Refractive Surgery, Vol.37(2) : 349-357, 2011 
Journal Title
 Journal of Cataract and Refractive Surgery 
Issue Date
Adult ; Epithelium, Corneal/surgery* ; Fourier Analysis ; Humans ; Keratomileusis, Laser In Situ/methods* ; Laser Therapy* ; Surgical Flaps*/pathology ; Tomography, Optical Coherence ; Young Adult
PURPOSE: To evaluate the thickness and side-cut angle of laser in situ keratomileusis (LASIK) flaps created by 1 of 3 femtosecond lasers or a microkeratome using Fourier-domain optical coherence tomography (OCT). SETTING: Department of Ophthalmology, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea. DESIGN: Comparative case series. METHODS: Flap creation for bilateral LASIK was performed using an IntraLase (femtosecond group 1), VisuMax (femtosecond group 2), or Femto LDV (femtosecond group 3) femtosecond laser or an M2 microkeratome. Flap thickness was determined at 14 points. The side-cut angle was measured in 4 directions at the margin interface. Measurements were taken 2 months postoperatively using an RTVue Fourier-domain OCT device and integrated software. RESULTS: Femtosecond group 1 comprised 50 eyes; femtosecond group 2, 40 eyes; femtosecond group 3, 64 eyes; and the microkeratome group, 52 eyes. Eyes in femtosecond groups 1 and 2 had relatively even flap configuration. Flaps in femtosecond group 3 and the microkeratome group had a meniscus shape. Flaps in femtosecond group 1 had the least difference between the mean peripheral and the central flap thickness (P<.001). The greatest flap thickness predictability (measured versus intended thickness) was in femtosecond group 3 (P<.001). Flaps in femtosecond group 1 had a side-cut angle closest to 90 degrees (P<.001). CONCLUSIONS: Flap morphology differed according to the system used. The 3 femtosecond laser systems appeared to be superior to the microkeratome system generally. The 3 femtosecond laser systems also produced different flap configurations depending on their individual mechanisms.
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1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Eung Kweon(김응권) ORCID logo https://orcid.org/0000-0002-1453-8042
Kim, Tae Im(김태임) ORCID logo https://orcid.org/0000-0001-6414-3842
Ahn, Hyun Seok(안현석)
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