J Korean Ophthalmol Soc.  2008 Feb;49(2):261-266. 10.3341/jkos.2008.49.2.261.

Axial Length and Anterior Chamber Depth by IOL-Master, A-scan according to Viscosity of Silicone Oil

• Lee MH
• Han YS
• Lee JS

• KMID: 2127117
• DOI: http://doi.org/10.3341/jkos.2008.49.2.261

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.

Keyword

Anterior chamber depth; Axial length; IOL-Master; Silicone oil; Viscosity

MeSH Terms

Anterior Chamber
Eye
Interferometry
Silicone Oils
Viscosity
Silicone Oils

Figure

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  Figure 1. Axial length (AXL) and anterior chamber depth (ACD) without conversion in silicone oil-filled eyes. Axial lengths were significantly different between two methods (p<0.05), but anterior chamber depths were not (p>0.05).

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  Figure 2. Axial length (AXL) and anterior chamber depth (ACD) in contralateral eye. There were no significant differences between the two methods (p>0.05).

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  Figure 3. Axial length by three methods in silicone oil-filled eye (A, B, C), by the two methods in contralateral eye (D, E). In silicone oil-filled eyes, axial lengths by IOL-master was not different to those by A scan with conversion factors (p>0.05). And in contralateral eyes, axial lengths were not different significantly between the two methods (p>0.05). A=IOL-Master; B=A-scan with conversion 0.64; C=A-scan with conversion 0.71; D=IOL- Master; E=A-scan.

Reference

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