Refractive Outcomes of Femtosecond LASIK for Myopic Correction at Siriraj Hospital, Thailand
Sabong Srivannaboon MD*,**, Pornlada Sunlakaviset MD*, Panida Kosrirukvongs MD*,**, Pinnita Prabhasawat, MD*,**, Wipawee Booranapong MD*,**, Suksri Chotikavanich MD*,**, Wasin Po-Ngam MA**
Affiliation : * Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand ** SiLASIK Center, Siriraj Hospital, Bangkok, Thailand
Objective : To evaluate refractive outcomes of myopic femtosecond LASIK at Siriraj Hospital, Thailand.
Material and Method: A retrospective study of patients who underwent femtosecond LASIK at SiLASIK center, Siriraj
hospital, Mahidol University, Thailand, from April 2009 to April 2010 was conducted. All patients had completely normal pre-
operative eye examination. All LASIK procedures were performed using Intralase® femtosecond laser (Abbott Medical Optics
Inc (AMO)) and VISX® star S4 excimer laser (AMO). Postoperative follow-up included visual acuity (ETDRS chart) and
manifest refraction at 1 day, 1 week, 1 month and 3 months. The flap thickness was evaluated at 3 months using Visante®
optical coherence tomography (OCT, Carl Zeiss Meditec).
Results : One hundred and twenty eight eyes of 64 patients were included in the study. Mean preoperative manifest refraction
spherical equivalent (MRSE) was -5.47 + 2.28 diopters (range, -1.88 to -12.63 diopters). At 3 months post-operation, the
MRSE was -0.26 + 0.39 diopters (range, + 0.25 to -2.00 diopters) and 95.31% were within + 1.00 diopter of intended
correction. There was 98% of eyes achieved uncorrected distance visual acuity (UDVA) 20/40 or better and 73% achieved
UDVA 20/20 or better. There was 31% of eyes gained one line and 15% lost 1 line of corrected distance visual acuity (CDVA).
The mean error of flap thickness (difference between actual and intended central flap thickness) was + 0.23 + 1.77 μm for 120
μm flap setting and + 0.22 + 0.97 μm for 110 μm flap setting. The flap morphology was planar configuration.
Conclusion : Myopic femtosecond LASIK at Siriraj Hospital provided satisfactory refractive outcomes and high accuracy of
the flap thickness.
Keywords : Refractive outcome, Myopia, Femtosecond LASIK, Thailand
