Comparison of Refractive Errors Measured by Several Different Methods.
- Author:
Sang Il CHOI
1
;
Eui Sang JUNG
;
Woo Jung KIM
Author Information
1. Department of Ophthalmology, Samsung Medical Center College of Medicine, Sungkyunkwan University, Seoul, Korea. wjkim@smc.samsung.co.kr
- Publication Type:Original Article
- Keywords:
Autorefraction;
Manifest refraction;
Cycloplegic refraction;
LASIK;
PRK
- MeSH:
Bias (Epidemiology);
Humans;
Keratomileusis, Laser In Situ;
Myopia;
Ophthalmology;
Refractive Errors*;
Retrospective Studies
- From:Journal of the Korean Ophthalmological Society
2001;42(12):1729-1733
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: Preoperative measurement of refractive error before LASIK or PRK is very important for good postoperative result because the measured refractive error is the basis of correction amount of operation. We analyzed the difference in spherical equivalent values of manifest refraction by operator (OMR), manifest and cycloplegic refraction by resident (RMR and RCR), noncycloplegic automated refraction (AMR). METHODS: The randomized charts of 50 patients (100 eyes) who had undergone LASIK or PRK for myopia at the Department of Ophthalmology at Samsung Medical Center between May 2000 and November 2000 were reviewed retrospectively and spherical equivalent values of preoperative OMR, RMR, RCR, and AMR by Nikon NRK-8000 autorefractor were analyzed by paired T-test. RESULTS: The mean spherical equivalent values of OMR, RMR, RCR, AMR were -5.40+/-2.10 D, -5.47+/-2.23 D, -5.36+/-2.18 D, -6.25+/-2.24 D, respectively. The spherical equivalent value of AMR was more myopic than the values of others and the bias was statistically significant. The absolute difference of spherical equivalent diopter between OMR and RMR was 0.27+/-0.27 D and that between OMR and RCR was 0.30+/-0.33 D. These two absolute difference did not show statistical significance. CONCLUSIONS: This study revealed that there was statistically significant difference in spherical equivalent diopter measured by AMR compared to those measured by OMR, RMR, or RCR. So we recommend the method of manifest and cycloplegic refraction by two ophthalmologists before LASIK or PRK for accurate measurement of refractive error.
