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접촉식 초음파와 부분결합간섭계를 이용한 생체계측시 백내장수술 후 굴절력 예측의 비교

Comparison of the Refractive Results Measured by Ultrasound and Partial Coherence Interferometers

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초록

목적: 접촉식 초음파 방식과 부분결합간섭계를 이용하여 얻은 계측치를 비교하고, 백내장수술 후 굴절력 예측의 정확성을 비교하고자하였다. 대상과 방법: 수정체유화술과 인공수정체삽입술을 받은 76명, 76안을 대상으로 하였다. 수술 전 접촉식 초음파 방식과 IOL MasterⓇ를이용하여 안축장과 전방깊이를 비롯한 생체계측을 하였다. 술 전에 SRK-T 공식을 이용하여 계산한 예상 굴절력과 백내장수술 2개월후 굴절검사를 시행하여 얻은 실제 굴절력 간의 오차를 비교하였다. 결과: IOL MasterⓇ 방식을 이용할 경우 초음파 방식보다 안축장이 0.09 mm 길게 측정되었지만 유의한 차이를 보이지 않았다(p=0.501). 평균 절대오차 값을 비교할 때 초음파 방식으로 안축장을 측정한 경우 0.53 ± 0.30 Diopter (D)였고, IOL MasterⓇ의 경우 0.55 ±0.41D으로 유의한 차이가 없었다(p=0.110). 결론: 초음파 방식에 비해 IOL MasterⓇ로 측정한 안축장이 더 길고, 전방깊이가 더 깊게 측정되었고 이러한 차이는 안축장이 짧을수록더 커졌으나 유의한 차이를 보이지 않았다. 인공수정체 도수 계산을 위한 수술 후 굴절력 예측의 정확도는 두 측정방법 간 차이가없었다.

Abstract

Purpose: To compare ocular biometry measured by applanation ultrasonography and IOL Master®, and evaluate the accuracies of the refractive outcome after cataract surgery. Methods: The biometries of 76 cataractous eyes were measured using ultrasonography and IOL Master®. The SRK-T formula was employed to predict the patient’s implanted IOL power. Two months after cataract surgery, the refractive outcome was determined, and results from the 2 different biometry methods were compared. Results: There were no statistically significant differences in axial length (AXL) and anterior chamber depth (ACD) between ultrasonography and IOL Master® (p = 0.501). When using ultrasonography, the mean absolute error (MAE) of the ultrasonography and IOL Master® was 0.53 ± 0.30 diopter (D), 0.55 ± 0.41 D, respectively. The difference between the 2biometry methods was not statistically significant (p = 0.110). Conclusions: Although the difference was not statistically significant, AXL measured by IOL Master® was longer and ACD measured by IOL Master® was deeper than when measured by A-scan. This difference was more pronounced in patients with a short AXL. The accuracy of IOL power calculation was similar between the 2 devices.

참고문헌 (17)

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