AL-ScanⓇ을 이용한 술 전 안구생체계측과 백내장수술 후 굴절력 예측의 정확성
Accuracy of Ocular Biometry and Postoperative Refraction in Cataract Patients with AL-ScanⓇ
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목적: AL-ScanⓇ으로 측정한 안축장을 IOL masterⓇ 및 A-scan과 비교하였고, 전방깊이, 각막굴절력의 값을 IOL masterⓇ와 비교하여, 백내장 수술 후 굴절력 예측의 정확성을 검토하고자 하였다. 대상과 방법: 본원에서 백내장 수술이 계획된 40안을 대상으로 AL-ScanⓇ, IOL masterⓇ와 A-scan을 이용하여 안축장, 전방깊이,각막굴절력을 측정하였다. 인공수정체의 도수결정은 SRK-T 공식을 이용했으며, 백내장 수술 4주 후 굴절검사를 시행하였고, 예측오차는 최종굴절력에서 예상굴절력을 뺀 차이로 구하였다. 결과: AL-scanⓇ, IOL masterⓇ, A-scan에서 안축장은 각각 23.08 ± 0.62 mm, 23.09 ± 0.62 mm, 22.99 ± 0.62 mm였고, A-scan 의 값이 통계적으로 유의하게 짧게 측정되었다(p＜0.001, p＜0.001). 전방 깊이와 각막굴절력은 AL-scanⓇ에서 각각 3.11 ± 0.06 mm,44.82 ± 1.34 D였고, IOL masterⓇ에서 3.13 ± 0.06 mm, 44.85 ± 1.26 D이며, 유의한 차이는 없었다(p=0.226, 0.331). 절대값 평균예측오차는 AL-scanⓇ에서 0.44 ± 0.35 D, IOL masterⓇ에서 0.40 ± 0.34 D였으며, A-scan에서 0.39 ± 0.30 D로 세 군간에 차이가 없었다(p=0.843, 0.847, 1.000). 결론: AL-ScanⓇ을 이용한 안축장, 전방깊이는 IOL masterⓇ를 이용한 측정치와 높은 일치도를 보였고, 술 후 예측오차에서도 차이가없었다.
Abstract
Purpose: To compare the axial lengths, anterior chamber depths, and keratometric measurements and to predict postoperative refractions of AL-Scan®, IOL master®, and ultrasound. Methods: A total of 40 eyes in 30 patients who received cataract surgery were included in the present study. The axial length, anterior chamber depth, and keratometry were measured by 2 types of partial coherence interferometry (AL-Scan®and IOL master®) and ultrasound. The SRK/T formula was used to calculate IOL power, and the predictive error which subtracts predictive refraction from postoperative refraction was compared among the ocular biometry devices. Results: Axial lengths were 23.08 ± 0.62 mm, 23.09 ± 0.62 mm, and 22.99 ± 0.62 mm measured by AL scan®, IOL master®,and ultrasound, respectively. Axial length measured by ultrasound was statistically significantly shorter than AL scan® and IOL master® (p < 0.001, p < 0.001, respectively). The anterior chamber depth and keratometry were 3.11 ± 0.06 mm and 44.82 ± 1.34 D measured by AL scan®, and 3.13 ± 0.06 mm and 44.85 ± 1.26 D measured by IOL master®, respectively. The differences of anterior chamber depth and keratometry between the 2 devices were not statistically significant (p =0.226, p = 0.331, respectively). The mean absolute prediction errors were 0.44 ± 0.35 D, 0.40 ± 0.34 D, and 0.39 ± 0.30 D in AL-Scan®, IOL master® and ultrasound, respectively, and were not statistically significantly different (p = 0.843, p =0.847, p = 1.000, respectively). Conclusions: The ocular biometric measurements and prediction of postoperative refraction using AL-Scan® were as accurate as IOL master® and ultrasound.
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