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Time course of changes in aniseikonia and visual function following vitrectomy for epiretinal membrane

Poster Details

First Author: F.Okamoto JAPAN

Co Author(s):    Y. Sugiura   Y. Okamoto   T. Oshika            0   0 0   0 0   0 0   0 0

Abstract Details


To quantify aniseikonia in patients undergoing vitrectomy for epiretinal membrane (ERM), and to investigate the relationship between aniseikonia and visual function.


This study included 44 eyes of 44 patients with idiopathic ERM.


We examined visual acuity, aniseikonia with the New Aniseikonia Test, metamorphopsia with M-CHARTS and central retinal thickness (CFT) with spectral-domain optical coherence tomography before and 3and 6 months after surgery.


Preoperative aniseikonia was 6.2% ± 4.5% [range -1% ~ +19.5%]. Of the 44 patients, 39 (89%) had macropsia, 1 (2%) had micropsia, and 4 (9%) had no aniseikonia. Aniseikonia at 3 months postoperatively was 6.2% ± 4.5% [range -2.5% ~ +19.0%] and at 6 months postoperatively was 6.5% ± 4.3% [range -1.5% ~ +17.0%]. Vitrectomy significantly improved visual acuity and metamorphopsia, but did not change aniseikonia. Postoperative aniseikonia had a significant correlation with preoperative aniseikonia (r = 0.728, p < 0.0001). Pre- and postoperative aniseikonia showed significantly correlation with pre- and postoperative metamorphopsia respectively, however, aniseikonia was not associated with visual acuity. At 6 months postoperatively, aniseikonia significantly correlated with CFT.


Most of the ERM patients had macropsia, which did not improve by surgery. Aniseikonia was associated with metamorphopsia.

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