| Comparison of the Refractive Error Measurement Using Different Methods in Wavefront-Guided LASEK. |
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Ji Min Ahn, Hyun Seok Ahn, Kyoung Yul Seo, Eung Kweon Kim, Tae Im Kim |
1The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. tikim@yuhs.ac
2Siloam Eye Hospital, Seoul, Korea. |
| 웨이브프론트 방식을 이용한 라섹 수술 시 수술 전 다양한 굴절 검사의 정확도 비교 |
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안지민1,2ㆍ안현석1ㆍ서경률1ㆍ김응권1ㆍ김태임1 |
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The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine1, Seoul, Korea Siloam Eye Hospital2, Seoul, Korea |
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| Abstract |
PURPOSE
To predict the accuracy of preoperative refractive error measurement methods in wavefront-guided laser-assisted subepithelial keratectomy (LASEK) surgery and to formulate a nomogram for satisfactory surgical results. METHODS: The medical records of 30 patients (57 eyes) who had undergone wavefront-guided LASEK were reviewed. The ideal surgical ablation amount was defined as the sum of the real surgical ablation amount and the remaining refractive errors. Comparison between the ideal surgical ablation amount and preoperative refractive errors was made using autorefraction, manifest refraction, cycloplegic refraction, postcycloplegic refraction, wavescan, and iTrace aberrometer measurements. RESULTS: The refractive errors measured by the postcycloplegic refraction showed the closest relation with the ideal surgical amount, and the nomogram based on this refraction correlated statistically significantly with the ideal surgical ablation amount. The refractive error using the wavescan also showed more accurate refractive measurements than the autorefractor and iTrace aberrometer. CONCLUSIONS: Accurate manifest refraction immediately before surgery is the most important in determining the ablation amount. Additionally, the refractive errors measured with the wavescan, which is an aberrometer used for wavefront-guided LASEK, showed a minimal amount of errors. After reviewing the results, the nomogram based on these 2 methods can be concluded to possibly contribute to an increase in the accuracy of surgery. |
| Key Words:
iTrace aberrometer;Nomogram;Postcycloplegic refraction;Wavefront-guided LASEK;Wavescan |
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