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Journal of Ophthalmology
Volume 2019, Article ID 7931654, 8 pages
https://doi.org/10.1155/2019/7931654
Research Article

Changes in Metamorphopsia, Visual Acuity, and Central Macular Thickness after Epiretinal Membrane Surgery in Four Preoperative Stages Classified with OCT B-Scan Images

1Department of Retina Center, Affiliated Eye Hospital of Wenzhou Medical University, Hangzhou, Zhejiang Province, China
2The People’s Hospital of Zhuji, Zhuji, Zhejiang Province, China
3Chicago College of Optometry, Midwestern University, Downers Grove, IL, USA
4The Second Hospital of Jiaxing, Jiaxing, Zhejiang Province, China

Correspondence should be addressed to Lijun Shen; nc.ca.eye.liam@jls

Received 13 March 2019; Revised 29 April 2019; Accepted 7 May 2019; Published 17 June 2019

Academic Editor: Inés Contreras

Copyright © 2019 Jianbo Mao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. To observe the changes in metamorphopsia, visual acuity, and central macular thickness (CMT) in patients undergoing vitrectomy for idiopathic epiretinal membranes (iERM); all of which were preoperatively stratified into 4 stages according to the anatomical structure of the macula seen on the optical coherence tomography (OCT) b-scan images. Methods. A total of 108 eyes of 106 patients were included. We evaluated and classified the severity of each preoperative ERM based on OCT. Changes in the best-corrected visual acuity (BCVA), metamorphopsia, and CMT were studied by comparing the pre- and postoperative measurements. The follow-up time was at least 6 months. Results. There were 41 eyes at stage 2, 35 at stage 3, 32 at stage 4, and none at stage 1. BCVA and metamorphopsia significantly improved at the final visit in all patients (). However, comparing the pre- and postoperative measurements at each stage, only the BCVA and CMT improved significantly for all stages (). For stages 2 and 3 ERMs, the horizontal (MH) and vertical (MV) metamorphopsia scores decreased significantly after surgery (). No significant difference was found in either MH or MV for stage 4 ERMs ( both >0.05). The preoperative BCVA, MH, and CMT had significant difference among the three stages (). Similarly, the postoperative values in the three variables mentioned above also had significant difference among the three stages (). For stage 2 ERMs, the baseline MH and MV were positively correlated with the baseline CMT. The MH and MV at the final follow-up also presented a significant positive correlation with the baseline CMT. For stage 3 ERMs, only the baseline MV showed significant correlation with the CMT. Conclusion. Categorization of the preoperative ERMs is a useful method to predict the postoperative improvement in metamorphopsia, which would aid in surgical decisions for patients with ERMs.