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KMID : 0360220130540111688
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Journal of the Korean Ophthalmological Society
2013 Volume.54 No. 11 p.1688 ~ p.1693
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Accuracy of Ocular Biometry and Postoperative Refraction in Cataract Patients with AL-Scan®
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Kim Sung-In
Kang Sug-Jae
Oh Tae-Hoon
Choi Jin-Seok
Baek Nam-Ho
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Abstract
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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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KEYWORD
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AL-Scan®, Axial length, IOL master®, Partial coherence interferometry
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