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목적: 접촉식인 A-scan (Pacscan 300A, Sonomed Inc., Chicago, IL, USA)과 광학적 방식인 IOL masterⓡ (Carl Zeiss Meditec,Germany), Pentacamⓡ (Oculus, Wetzlar, Germany), 그리고 Orbscan IIⓡ (Orbtek Inc., USA)를 이용하여 전방깊이를 측정한 후 각검사방법의 재현성 및 일치 정도를 비교하고자 하였다. 대상과 방법: 백내장수술 예정인 환자 94명(188안)에 대해 접촉식 방식인 A scan과 광학적 방식인 IOL masterⓡ, Pentacamⓡ,Orbscan IIⓡ를 이용하여 전방깊이를 측정한 후 비교하였다. 네 기기의 신뢰성을 알아보기 위하여 변동계수, 표준편차, 그룹 내 변동계수를 계산하였고 기기간 전체 평균 차이를 반복측정 분산분석과 Bland-Altman plot를 이용하여 비교하였다. 결과: A-scan, IOL masterⓡ, Pentacamⓡ, Orbscan IIⓡ로 측정한 평균 전방깊이는 각각 2.89 ± 0.49 mm, 3.25 ± 0.45 mm, 3.21± 0.46 mm, 3.19 ± 0.47 mm로 측정방식에 따라 유의 차이가 있었다(p<0.01). 네 가지 측정 방식의 변이계수는 각각 2.50%,0.87%, 1.25%, 1.04%로 A scan에 비해 IOL masterⓡ, Pentacamⓡ, Orbscan IIⓡ이 더 재현성이 높았다. 상관계수는 IOL masterⓡ와A scan은 0.65, IOL masterⓡ와 Pentacamⓡ은 0.91, IOL masterⓡ와 Orbscan IIⓡ은 0.90, A scan과 Pentacamⓡ은 0.69, A scan과Orbscan IIⓡ는 0.71, Pentacamⓡ과 Orbscan IIⓡ는 0.93이었다. 결론: 전방깊이의 측정방법에서 접촉식 방식인 A-scan보다 광학적 방식인 IOL masterⓡ, Pentacamⓡ, Orbscan IIⓡ을 사용했을 경우전방깊이가 유의하게 깊게 측정되었다(p<0.01). 광학적 측정방식들끼리는 상관계수가 높았고, 재현성 또한 높았으며 그 중에서 IOLmasterⓡ가 가장 낮은 변이계수를 보였다.
Purpose: To assess the reproducibility and reliability of applanation A-scan ultrasonography (Pacscan 300A, Sonomed Inc., Chicago, IL, USA) and optical measurements with IOL Master® (Carl Zeiss Meditec, Germany), Pentacam® (Oculus,Wetzlar, Germany), and Orbscan II® (Orbtek Inc., Laredo, TX, USA) when measuring anterior chamber depth (ACD).
Methods: In this study of 188 eyes of 94 patients, ACD estimation prior to cataract surgery was preformed by the applanation A-scan method and IOL Master®, Pentacam®, and Orbscan II® optical methods. Repeatability from each device was evaluated by coefficient of variation, standard deviation, and intraclass correlation coefficient. RM-ANOVA on Ranks was used to compare the differences in ACD among the devices. The Bland-Altman plot was performed to assess agreement in measurements between the devices.
Results: The mean ACD according to the applanation A-scan method and IOL Master®, Pentacam®, and Orbscan II® optical methods were 2.89 ± 0.49 mm, 3.25 ± 0.45 mm, 3.21 ± 0.46 mm, and 3.19 ± 0.47 mm, respectively, and the differences were statistically significant (p < 0.01). The coefficient of variation for the 4 methods was 2.50% in the A-scan, 0.87% in the IOL Master®, 1.25% in the Pentacam®, and 1.04% with Orbscan II®, and reproducibility was higher with the optical principle devices. The correlation coefficient between A-scan and IOL Master® was 0.65, between IOL Master® and Pentacam®0.91, between IOL Master® and Orbscan II® 0.90, between A-scan and Pentacam® 0.69, between A-scan and Orbscan II®0.71, and between Pentacam® and Orbscan II® 0.93.
Conclusions: Applanation A-scan provided lower measurements for ACD compared with IOL Master®, Pentacam® and Orbscan II®. There was good agreement between results obtained with the latter 3 methods, and reproducibility was high with optical measurements. The coefficient of variation was low for IOL Master®.| 번호 | 참고문헌 | 국회도서관 소장유무 |
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| 1 | Sources of error in intraocular lens power calculation ![]() |
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| 2 | Standardizing constants for ultrasonic biometry, keratometry, and intraocular lens power calculations ![]() |
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| 3 | Phakic anterior chamber lenses for the correction of myopia: A 7-year cumulative analysis of complications in 263 cases ![]() |
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| 4 | Refractive Power Calculations for Intraocular Lenses in the Phakic Eye ![]() |
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| 5 | Comparative estimation of anterior chamber depth by ultrasonography, Orbscan II, and IOLMaster ![]() |
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| 6 | Anterior chamber depth measured by two methods in myopic and hyperopic phakic IOL implant. ![]() |
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| 7 | Biometric analysis of anterior segments of the eye with Scheimpflug Camera according to the type of cataract | 소장 |
| 8 | The Reproducibility and Accuracy of Biometry Parameter Measurement from IOL Master(R) | 소장 |
| 9 | Comparison of IOL Master, A-scan and Orbscan II for Measurement of Axial Length and Anterior Chamber Depth | 소장 |
| 10 | Anterior chamber depth measurement: A-scan versus optical methods ![]() |
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| 11 | Measuring anterior chamber depth with the Orbscan Topography System ![]() |
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| 12 | Biometric Analysis of the Normal Aged Eye with Photodocumentation Method | 소장 |
| 13 | Comparison of Central Corneal Thickness Measured With Orbscan and Pentacam ![]() |
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| 14 | A Study on Central Corneal Pachymetry Maps with Orbscan Corneal Pachymetry System in Myopic Eyes | 소장 |
| 15 | Comparison of A-scan, Scheimpflug Camera, and Orbscan for Measurement of Anterior Chamber Depth | 소장 |
| 16 | Anterior chamber depth measurement in phakic and pseudophakic eyes. ![]() |
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| 17 | Ocular Component Measurement Using the Zeiss IOLMaster ![]() |
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| 18 | Accuracy of the Haigis Formula Based on Axial Length and Anterior Chamber Depth | 소장 |
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