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KMID : 0360220080490020261
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Journal of the Korean Ophthalmological Society
2008 Volume.49 No. 2 p.261 ~ p.266
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Axial Length and Anterior Chamber Depth by IOL-Master, A-scan according to Viscosity of Silicone Oil
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Lee Min-Ho
Han Young-Sang
Lee Jong-Soo
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Abstract
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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.
Conclusion : 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.
J Korean Ophthalmol Soc 49(2):261-266, 2008
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KEYWORD
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Anterior chamber depth, Axial Length, IOL-Master, Silicone oil, Viscosity
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