Excimer Laser Photorefractive Keratectomy and Laser
in situ Keratomileusis for Myopia and Astigmatismt
NGAMJIT KASETSUWAN, M.D.*,
VILAVUN PUANGSRICHARERN, M.D.*,
LALIDA PARIYAKANOK, M.D.*
Affiliation : *Department of Ophthalmology, Faculty of Medicine, Chulalongkom University, Bangkok 10330, Thailand.
t This study was presented at the Royal Thai College of Ophthalmology Annual Meeting, Bangkok, July 1998.
AbstractThe efficacy, predictability, safety, and short-term stability of excimer laser photorefrac-
tive keratectomy (PRK) and laser in situ keratomileusis (LASIK) for treatment of myopia and
astigmatism were determined. The preoperative myopia ranged from -1.50 to -15.75 D and the
astigmatism was less than 4.0 D. Of the 147 eyes, 73 and 74 underwent PRK and LASIK, res-
pectively. Mean preoperative spherical equivalent refraction (SE) was -3.72±1.69 D in the PRK
group and -7.66±2.30 D in the LASIK group. Mean postoperative SE at the last examination
(3 to 6 months) was -0.13±0.82 D and -0.38±1.19 D in the PRK and LASIK groups, respec-
tively. Eighty six percent in the PRK group and 77 per cent in the LASIK group achieved a SE
within ± 1.0 D and the refractions were stable between I month and 3-6 months. Uncorrected
visual acuity of 20/40 or better was noted in 91 per cent in the PRK group and 97 per cent in the
LASIK group. No eyes lost one or more lines of best spectacle-corrected visual acuity in both
groups. PRK and LASIK appear to be effective, safe, predictable, and short-term stable in treating
myopia and astigmatism. Longer follow-up studies will help evaluate the long-term stability
of the procedure and possibility of later complications.
Keywords : Excimer Laser, Photorefractive Keratectomy (PRK), Laser in situ Keratomileusis
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