Refraction before and after LASIK.

Lee, Damho; Wie, Hoyoung; Kim, Joon Mo

Original Article

Journal of the Korean Ophthalmological Society 2003;44(11):2585-2590.
Published online November 1, 2003.

Refraction before and after LASIK.

Damho Lee, Hoyoung Wie, Joon Mo Kim

¹Vision Eye Center, Korea. damholee@unitel.co.kr
²Department of Ophthalmology, National Medical Center, Korea.

라식수술 전 후의 굴절검사

이담호 ( Lee Dam Ho ) , 위호영 ( Wi Ho Yeong ) , 김준모 ( Kim Jun Mo )

Abstract

PURPOSE
It is important to know the accurate refractive error of the patients before LASIK because the amount of ablation is determined by that. We analyzed whether there are differences among the preoperative and postoperative results of cycloplegic retinoscopy (CR), module setting value, and autorefraction with and without cycloplegia (ACR, AMR). METHODS: The manifest and cycloplegic refractions of 104 eyes of 104 patients who underwent LASIK from February 2001 to July 2001 were reviewed. The preoperative and postoperative cycloplegic refraction, autorefraction by Canon RK-5, and module setting value were analyzed. RESULTS: In comparison of the preoperative values, AMR showed myopic shift compared to CR, module setting, and ACR (p<.001). ACR showed hyperopic shift compared to CR (p<0.001). The module setting showed myopic shift compared to CR, but it was not statistically significant. Postoperative mean spherical equivalent was 0.04 +/- 0.67D(range: -1.75 ~ +1.5). In comparison of the postoperative results, ACR showed hyperopic shift compared to CR (p<0.001) and AMR showed myopic shift compared to CR (p<0.001). CONCLUSIONS: As there is a difference between autorefraction and cycloplegic refraction, it is inappropriate to decide the amount of ablation only by one method. Hence when LASIK or LASIK retreatment is planned, cycloplegic refraction as well as autorefraction is necessary.

Key Words: Autorefraction;Cycloplegic retinoscopy;LASIK