J Korean Ophthalmol Soc.  2009 Aug;50(8):1226-1231. 10.3341/jkos.2009.50.8.1226.

Comparison of IOLMaster(R) and A-Scan Ultrasound: Change in Axial Length After Vitrectomy in Macular Disease

• Lee SW
• Kim YG
• Lee SJ
• Kim DK
• Kwak HW
• Yu SY

• KMID: 2212539
• DOI: http://doi.org/10.3341/jkos.2009.50.8.1226

Abstract

PURPOSE
To evaluate the differences between IOLMaster(R) and A-scans in changes in axial length after vitrectomy in patients with macular disease. METHODS: Using IOLMaster(R) 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(R) (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(R): 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(R) is more useful than the A-scan when measuring axial length without refractive errors after vitrectomy in eyes with macular disease.

Keyword

A-scan; Axial length; Central macular thickness; IOLMaster(R); Vitrectomy

MeSH Terms

Epiretinal Membrane
Eye
Humans
Refractive Errors
Retinal Perforations
Vitrectomy

Figure

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  Figure 1. Scatter plot demonstrating the difference in the absolute error in axial length using IOLMasterⓇ and A− scan versus change in central macular thickness using optical coherence tomography after vitrectomy in epiretinal membrane and macular hole eyes (IOLMasterⓇ: Epiretinal Membrane; correlation coefficient=−0.182, p>0.05, Macular Hole; correlation coefficient=−0.054, p>0.05, A-scan: Epiretinal Membrane; correlation coefficient=−0.210, p>0.05, Macular Hole; correlation coefficient=−0.156, p>0.05).

Reference

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