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Akihisa Watanabe, Hiroyuki Kondo; Persistence of metamorphopsia after vitrectomy for epiretinal membrane. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):5058.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the reduction in the metamorphopsia score (M-score) and the thickness of the retinal layers after vitrectomy for idiopathic epiretinal membrane (ERM), and to identify factors that predict the persistence of metamorphopsia.
We reviewed the medical records of 27 eyes and 25 patients who had undergone vitrectomy for an idiopathic ERM. The changes in the visual acuity, M-score determined by M-CHARTS, and thickness of the inner nuclear layer (INL) and central foveal thickness (CFT) measured by spectral-domain optical coherence tomography (SD-OCT) were evaluated before and 6-months after the vitrectomy. The eyes were divided into 2 groups based on the presence or absence of metamorphopsia at 6-months after surgery. Group A had no or very reduced postoperative M-score (0 to 0.3; n=16) and Group B had persistent metamorphosia with M-scores >0.3 (n=11).
The M-score at 6-months after surgery was significantly correlated with the preoperative M-score (r = 0.57, P<0.01), visual acuity (r = 0.42, P<0.05), and INL thickness (r = 0.41, P<0.05). The preoperative M-score was significantly greater in Group B than in Group A (P<0.05), but the INL thickness was not significantly different in the two groups. The postoperative INL was significantly thicker in Group B than in Group A (P<0.05). The decrease in M-score was greater in Group A than in Group B (P<0.05), but the decrease in INL thickness was not significantly different.
A persistence of metamorphopsia after surgery can be predicted by the preoperative M-score. The INL thickness was significantly decreased postoperatively in eyes with high preoperative M-scores (>0.3).
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