Journal of the Korean Ophthalmological Society 2007;48(1):27-32.
Published online January 31, 2007.
Comparison of The IOL Master(R) and A-scan Ultrasound: Refractive Results of 96 Consecutive Cases.
Joon Seo Hwang, Jin Hak Lee
1Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea. jjhlee@plaza.snu.ac.kr
2Seoul Artificial Eye Center, Seoul National University Hospital Clinical Reaserch Institute, Seoul, Korea.
부분결합간섭계와 초음파를 이용한 안축장 측정시 백내장 수술 후 굴절력 예측의 비교
황준서1,2,이진학1,2
Department of Ophthalmology, Seoul National University College of Medicine1, Seoul, Korea Seoul Artificial Eye Center, Seoul National University Hospital Clinical Reaserch Institute2, Seoul, Korea
Correspondence:  Joon Seo Hwang, M.D.1,2
Abstract
PURPOSE
To study the refractive outcome of cataract surgery employing partial coherence interferometry (PCI) and to compare this outcome with that of A-scan ultrasound in a prospective study of 96 eyes of 96 patients that underwent phacoemulsification with intraocular lens (IOL) implantation. METHODS: The SRK-T formula was employed, using PCI (IOL Master(R): the only commercially available model) and A-scan ultrasound data, to predict patients' implanted IOL power. Four to six weeks after cataract surgery, the refractive outcome was determined, and results from the two different biometry methods were compared. RESULTS: Ninety-six patients (mean age: 67.64, SD: 9.91) underwent phacoemulsification with IOL implantation. The optical axial length obtained using the IOL Master(R) was significantly longer (p<0.001, Student's t-test) than the axial length obtained via by A-scan ultrasound, 24.29 (SD 1.80) mm vs. 24.19 (1.75) mm. When using the IOL Master(R), the mean prediction error (PE; planned target of refraction - postoperative refraction) was 0.30 (0.60) D, and the mean absolute prediction error (APE) was 0.51 (0.44) D. When using A-scan ultrasound, the mean PE was 0.01 (0.64) D, and the mean APE was 0.47 (0.43) D. The difference in mean APE between the two biometry methods was not statistically significant (p=0.236, Wilcoxon signed rank test). Among the eyes with an axial length greater than 25 mm, as determined by A-scan ultrasound, the difference in the mean APE was not statistically significant (0.48 (0.87) vs. 0.58 (0.61), p=0.094). Likewise, among the eyes for which with axial length measured by A-scan ultrasound longer than IOL Master(R), the difference in the mean APE error was not statistically significant, (0.33 (0.30) vs. 0.46 (0.41), p=0.110). CONCLUSIONS: IOL power calculation using the PCI is as accurate as that using A-scan ultrasound for predicting the postoperative refractive state of patients who have undergone cataract surgery.
Key Words: A-scan;Axial length;IOL Master;IOL power calculation;Partial coherence interferometer


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