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KMID : 0360220090500081226
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Journal of the Korean Ophthalmological Society
2009 Volume.50 No. 8 p.1226 ~ p.1231
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Comparison of IOLMasterⓡ and A-Scan Ultrasound: Change in Axial Length After Vitrectomy in Macular Disease
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Lee Seung-Won
Yu Seung-Young
Hyung Woo Kwak
Lee Seung-Jun
Kim Young-Gyun
Kim Do-Kyun
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Abstract
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Purpose: To evaluate the differences between IOLMasterⓡ and A-scans in changes in axial length after vitrectomy in patients with macular disease.
Methods: Using IOLMasterⓡ and A-scans, we measured preoperative and postoperative axial length in 12 eyes with epiretinal membranes (ERM) and in 8 eyes with macular holes (MH). The relationship between the absolute error in axial length after vitrectomy and both methods was assessed using Mann-Whitney U test. The correlation to central macular thickness was evaluated by Spearman’s correlation coefficient.
Results: In eyes with ERM and MH, preoperative and postoperative axial lengths obtained with both methods had no significant difference (p >0.05). The absolute error in axial length after vitrectomy was not significant using IOLMasterⓡ (ERM: 0.07±0.05 mm, MH: 0.04±0.02 mm, p >0.05) but was significant using A-scan (ERM: 0.20±0.11 mm, MH: 0.30±0.07 mm, p <0.05). The correlation between the change of axial length after vitrectomy and the central macular thickness was poor (IOLMasterⓡ: ERM; correlation coefficient = -0.182, p >0.05, MH; correlation coefficient = -0.054, p >0.05, A-scan: ERM; correlation coefficient = -0.210, p >0.05, MH; correlation coefficient = -0.156, p >0.05).
Conclusions: The IOLMasterⓡ is more useful than the A-scan when measuring axial length without refractive errors after vitrectomy in eyes with macular disease.
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KEYWORD
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A-scan, Axial length, Central macular thickness, IOLMasterⓡ, Vitrectomy
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