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Original ArticleOpen Access
Excimer Laser Photorefractive Keratectomy and Laser in situ Keratomileusis for Myopia and Astigmatism
Kasetsuwan N 
,
Puangsricharem V ,
Pariyakanok L
,
Puangsricharem V ,
Pariyakanok L The 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 -3.72เธ‘1.69 D in the PRK
group and -7.66เธ‘2.30 D in the LASIK group. Mean postoperative SE at the last examination
(3 to 6 months) was -0.13เธ‘0.82 D and -0.38เธ‘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 เธ‘ 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.
Key word : Excimer Laser, Photorefractive Keratectomy (PRK), Laser
in situ
Keratomileusis
(LASIK)
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 -3.72เธ‘1.69 D in the PRK
group and -7.66เธ‘2.30 D in the LASIK group. Mean postoperative SE at the last examination
(3 to 6 months) was -0.13เธ‘0.82 D and -0.38เธ‘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 เธ‘ 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.
Key word : Excimer Laser, Photorefractive Keratectomy (PRK), Laser
in situ
Keratomileusis
(LASIK)
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