접촉식 초음파와 세 가지 광학간섭계를 이용한 생체계측과 백내장수술 후 굴절력의 비교
Comparison of Biometric Measurements and Refractive Results between Applanation Ultrasonography and Three Different Interferometries
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목적: 접촉식 초음파와 세 가지 광학간섭계를 이용하여 얻은 생체계측치를 비교하고, 백내장수술 후 굴절력 예측의 정확성을 비교하고자 하였다. 대상과 방법: 백내장수술을 시행 받은 31안을 대상으로 접촉식 초음파, Lenstar LS900Ⓡ, AL-ScanⓇ, OA-2000Ⓡ을 이용하여 안축장, 전방깊이, 각막굴절력을 측정하였다. SRK/T 공식으로 인공수정체 도수를 결정했으며 예상 굴절력과 백내장수술 2개월 후의 실제 굴절력 간의 오차를 비교하였다. 결과: 접촉식 초음파, Lenstar LS900Ⓡ, AL-ScanⓇ, OA-2000Ⓡ으로 측정된 안축장의 평균은 각각 23.39 ± 0.95 mm, 23.42 ± 0.98 mm, 23.43 ± 0.98 mm, 23.44 ± 0.98 mm였으며 통계적으로 유의한 차이가 없었다(p=0.996). Lenstar LS900Ⓡ, AL-ScanⓇ, OA-2000Ⓡ의 전방깊이는 각각 3.14 ± 0.41 mm, 3.10 ± 0.38 mm, 3.13 ± 0.39 mm (p=0.936), 평균 각막굴절력은 각각 44.41 ± 1.52D, 44.54 ± 1.57D, 44.44 ± 1.52D (p=0.937)로 모두 유의한 차이가 없었다. 네 가지 계측 방법에서 평균 절대오차는 통계적으로 유의한 차이가 없었다(p=0.722). 결론: 접촉식 초음파, Lenstar LS900Ⓡ, AL-ScanⓇ, OA-2000Ⓡ을 이용하여 측정한 안축장, 전방깊이 및 각막굴절력은 높은 일치도를보였으며, 백내장수술 후 굴절력 예측의 정확도는 네 가지 측정 방법 간 차이가 없었다.
Abstract
Purpose: To compare ocular biometry and refractive results measured using conventional applanation ultrasonography and 3 different optical interferometries, Lenstar LS900®, AL-Scan® and OA-2000®. Methods: The biometries of 31 cataractous eyes were measured using ultrasonography, Lenstar LS900®, AL-Scan® or OA-2000®. The axial length, anterior chamber depth and keratometry were measured. The SRK/T formula was used to calculate intraocular lens power. Two months after cataract surgery, the refractive outcome was determined and results from the 4 different biometry methods were compared. Results: Axial lengths were 23.39 ± 0.95 mm, 23.42 ± 0.98 mm, 23.43 ± 0.98 mm and 23.44 ± 0.98 mm measured using ultrasonography, Lenstar LS900®, AL-Scan® and OA-2000®, respectively with no statistically significant differences observed (p = 0.996). The anterior chamber depth and keratometry were 3.14 ± 0.41 mm, 3.10 ± 0.38 mm and 3.13 ± 0.39 mm (p = 0.936) and 44.41 ± 1.52 D, 44.54 ± 1.57 D and 44.44 ± 1.52 D (p = 0.937) for Lenstar LS900®, AL-Scan® and OA-2000® respectively. There were no statistically significant differences between the 3 optical devices. The mean absolute error of the 4 different devices were not statistically significant (p = 0.722). Conclusions: The ocular biometric measurements and prediction of postoperative refraction using ultrasonography, Lenstar LS900®, AL-Scan® or OA-2000® showed no significant differences.
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