Purpose: To examine 1-year outcomes of metamorphopsia and tangential retinal displacement after epiretinal membrane surgery and identify predictors for metamorphopsia score at 1 year and its improvement from baseline. Methods: M-CHARTS were used to measure metamorphopsia. Distances between the intersections of two sets of retinal vessels were measured with infrared or autofluorescence images. Predictors for metamorphopsia scores at 1 year after surgery and their differences from baseline were identified with multivariate regression analysis. Results: Ninety-two eyes of 90 consecutive patients were included. The vertical and horizontal distances continued expanding for 1 year (P < 0.001). Both vertical and horizontal metamorphopsia scores improved 3 months after surgery (P = 0.025 and P < 0.001, respectively), and horizontal scores continued improving for a year. Horizontal metamorphopsia scores correlated with retinal displacement more strongly than vertical scores. Higher metamorphopsia score at baseline is predictive for that at 1 year. Older age and being male are predictive for less improvement of the score at 1 year from baseline. Conclusion: Metamorphopsia correlates with tangential retinal displacement at 1 year after epiretinal membrane surgery. Horizontal metamorphopsia scores keep improving until 1 year postoperatively. Being male and older age are both independent predictors for poor improvement of metamorphopsia after epiretinal membrane surgery.
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