| Comparison of Partial Interferometry and Ultrasound A-scan for Axial Length Measurement in Retinal Vein Occlusions. |
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Jae Yun Sung, Dong Won Heo, Young Joon Jo, Jung Yeul Kim |
1Department of Ophthalmology, Chungnam National University School of Medicine, Daejeon, Korea. kimjy@cnu.ac.kr
2Research Institute for Medical Sciences, Chungnam National University, Daejeon, Korea. |
| 망막정맥폐쇄 환자에서 부분빛간섭계와 초음파를 이용하여 측정한 안축장의 비교 |
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성재연1⋅허동원1⋅조영준1,2⋅김정열1,2 |
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충남대학교 의과대학 안과학교실1, 충남대학교 의학연구소2 |
Correspondence:
Jung Yeul Kim,
Email: kimjy@cnu.ac.kr
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Received: 28 January 2016 • Revised: 1 June 2016 • Accepted: 14 July 2016 |
| Abstract |
PURPOSE
To evaluate the significance of axial length, which is a known risk factor of retinal vein occlusion, we measured the axial lengthby using contact A-scan sonography and partial interferometry and compared the two values. METHODS: This study included 19 patients complaining of visual symptoms and who were diagnosed with unilateral retinal vein occlusion (RVO) with macular edema (ME). Affected eyes were classified as the study group, and healthy fellow eyes were classified as the control group. We measured the central macular thickness (CMT) and axial length (AL) of the affected and fellow eyes and compared them. CMT was measured by optical coherence tomography (Stratus OCT, Carl Zeiss, Jena, Germany), and AL was measured by interferometry (IOL Master®, Carl Zeiss, Jena, Germany). RESULTS: In RVO patients, CMT was significantly different between affected eyes (485.7 ± 111.3 µm) and fellow eyes (197.8 ± 29.7 µm; p < 0.001). Axial length measured by A-scan sonography was 23.06 ± 0.86 mm in the affected eyes and 23.28 ± 0.93 mm in the healthy eyes, which was statistically different (p < 0.001). However, using partial interferometry, the AL was 23.35 ± 0.87 mm in the affected eyes and 23.38 ± 0.95 mm in the healthy eyes. No significant difference was found. CONCLUSIONS: We confirmed that short AL, which was once thought to be a risk factor of RVO, results from the properties of the instruments used for measurement. Moreover, we verified that partial interferometry is more accurate for measurement of AL than A-scan sonography when retinal vein occlusion is associated with ME. |
| Key Words:
Axial length;Central macular thickness;Macular edema;Retinal vein occlusion |
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