| Axial Length and Anterior Chamber Depth by IOL-Master, A-scan according to Viscosity of Silicone Oil. |
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Min Ho Lee, Young Sang Han, Jong Soo Lee |
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Department of Ophthalmology, College of Medicine, Pusan National University, Pusan, Korea. jongsool@pusan.ac.kr |
| 실리콘기름 주입안에서 점도에 따른 레이저 간섭계와 초음파로 측정된 안축장과 전방 깊이 비교 |
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이민호ㆍ한영상ㆍ이종수 |
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Department of Ophthalmology, College of Medicine, Pusan National University1, Pusan, Korea |
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Correspondence:
Min Ho Lee, M.D. |
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| Abstract |
PURPOSE
To evaluate differences between partial coherence laser interferometry (IOL-Master, Zeiss) and A-scan measurement of axial length and anterior chamber depth in silicone oil-filled eyes according to viscosity. METHODS: Using IOL-Master and A-scan, axial length and anterior chamber depth in silicone oil-filled eyes (n=54) and normal eyes (control, n=54) were measured and analyzed. In silicone oil-filled eyes, calculated axial lengths by A-scan using conversion factors, axial length multiplied by 0.71, and vitreous cavity multiplied by 0.64 (classic method) were compared with those calculated by IOL-Master. Anterior chamber depths were also analyzed., and axial lengths and anterior chamber depths were compared according to the viscosities of silicone oil for measurement by A-scan. RESULTS: Axial length and anterior chamber depth using IOL-Master were shorter than those using A-scan by 9.45+/-1.81 mm (p<0.05) and 0.11+/-1.29 mm, respectively. In normal eyes, axial length and anterior chamber depth using IOL-Master and A-scan were not significantly different. In silicone oil-filled eyes, axial length using IOL-Master and conversion factor was also not significantly different. At the highest silicone oil viscosity the difference in measured axial length was greatest (p<0.05) while the difference in anterior chamber depths was smallest. CONCLUSIONS: In silicone oil-filled eyes, axial length by IOL-Master was more accurate than that by A-scan, regardless of silicone oil viscosity. Thus, IOL-Master is more useful than A-scan when measuring axial length in silicone oil-filled eyes. |
| Key Words:
Anterior chamber depth;Axial length;IOL-Master;Silicone oil;Viscosity |
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