title: Two-year results of metamorphopsia, visual acuity, and optical coherence tomographic parameters after epiretinal membrane surgery.
abstract: OBJECTIVE
  To determine the 2-year results of metamorphopsia, visual acuity, and optical coherence tomographic (OCT) parameters after epiretinal membrane (ERM) removal, and to evaluate the correlations among them.
  
  
  METHODS
  We studied 75 eyes of 75 patients with an ERM who underwent vitrectomy and membrane peeling. The best-corrected visual acuity (BCVA), metamorphopsia scores, and OCT parameters were measured at the baseline, and 1, 3, 6, 9, 12, 18, and 24 months postoperatively. M-CHARTS were used to quantify the degree of metamorphopsia.
  
  
  RESULTS
  The mean BCVA, degree of metamorphopsia, and all of the OCT parameters except the photoreceptor outer segment (PROS) length improved significantly from that at the baseline at 24 months (P < 0.001). However, they were not significantly different from those at 12 months. The better BCVA at 24 months was correlated with the longer PROS length at the baseline (P < 0.01). The degree of metamorphopsia at 24 months was significantly correlated with that at baseline (P < 0.01).
  
  
  CONCLUSIONS
  A postoperative follow-up period of 12 months may be sufficient to assess the improvements induced by the ERM surgery. The preoperative PROS length was the prognostic factor for the postoperative BCVA. The preoperative degree of metamorphopsia was the prognostic factor for the postoperative degree of metamorphopsia, suggesting that surgery for ERM should be performed before development of severe metamorphopsia.
authors: Department of Ophthalmology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan. knst129@gmail.com.|Department of Ophthalmology, Sapporo City General Hospital, Sapporo, Japan. knst129@gmail.com.
authors: Takamasa
authors: T
authors: Kinoshita
authors: Department of Ophthalmology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.|Department of Ophthalmology, Sapporo City General Hospital, Sapporo, Japan.
authors: Hiroko
authors: H
authors: Imaizumi
authors: Department of Ophthalmology, Sapporo City General Hospital, Sapporo, Japan.
authors: Hirotomo
authors: H
authors: Miyamoto
authors: Department of Ophthalmology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors: Takashi
authors: T
authors: Katome
authors: Department of Ophthalmology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors: Kentaro
authors: K
authors: Semba
authors: Department of Ophthalmology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors: Yoshinori
authors: Y
authors: Mitamura
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019773:Epiretinal Membrane / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009887:Ophthalmoscopy; D011446:Prospective Studies; D066167:Slit Lamp; D041623:Tomography, Optical Coherence; D014065:Tonometry, Ocular; D014786:Vision Disorders / Q000503:physiopathology*; D014792:Visual Acuity / Q000502:physiology*; D014821:Vitrectomy
keywords: Epiretinal membrane; M-CHARTS; Metamorphopsia; Optical coherence tomography; Visual acuity; Vitrectomy