The Effect of PRK and LASIK for the Correction of Postkeratoplasty Astigmatism.

Kim, Kyu Seop; Kim, Man Soo

Original Article

Journal of the Korean Ophthalmological Society 2004;45(3):376-382.
Published online March 1, 2004.

The Effect of PRK and LASIK for the Correction of Postkeratoplasty Astigmatism.

Department of Ophthalmology, Kangnam St. Mary's Hospital, The Catholic University of Korea, College of Medicine, Seoul, Korea. mskim@cmc.cuk.ac.kr

각막이식 후 발생한 난시에 대한 PRK와 LASIK의 교정효과

김규섭 ( Kim Gyu Seob ) , 김만수 ( Kim Man Su )

Abstract

PURPOSE
To evaluate the effect of photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) procedure on eyes with high astigmatism after penetrating keratoplasty. METHODS: Thirteen eyes of 12 patients who had PRK (6 eyes) or LASIK (7 eyes) after penetrating keratoplasty were retrospectively reviewed. All patients had a stable postkeratoplasty astigmatism over 4.0D for a minimum of 6 months after all sutures were removed. We followed up patients in early phase (1~3 months) and late phase (6~12 months). RESULTS: Mean preoperative astigmatism in PRK patients was 7.96 +/- 2.63D and in LASIK patients 8.27 +/- 2.96D. Astigmatic magnitude decreased 54% in early phase, and 34% in late phase in PRK group. It decreased 58% in early phase, and 55% in late phase in LASIK group. The reduction of astigmatism and postoperative regression were not stastically significant between two groups. Postoperative uncorrected visual acuity improved 67% in PRK group and 86% in LASIK group above 2 Snellen chart lines. Postoperative corneal haze developed in 3 eyes of PRK group. CONCLUSIONS: PRK and LASIK resulted in improved uncorrected visual acuity and refraction in postkeratoplsty eyes with high astigmatism. But both procedures showed cylinderical undercorrection and postoperative regression in refraction. Mild corneal haze was common after PRK procedure.

Key Words: Laser in situ keratomileusis (LASIK);Photorefractive keratectomy (PRK);Postkeratoplasty astigmatism