title: Macular function and ultrastructure of the internal limiting membrane removed during surgery for idiopathic epiretinal membrane.
abstract: BACKGROUND
  To determine the effect on macular function of removal of the internal limiting membrane (ILM) during epiretinal membrane surgery.
  
  
  METHODS
  Prospective, interventional study.
  
  
  METHODS
  Twenty-two eyes of 22 patients with idiopathic epiretinal membranes undergoing surgery.
  
  
  METHODS
  Histologic analysis of the ILM specimens were classified based on amount of retinal tissue fragments attached to the removed ILM. The ophthalmic examinations were assessed prospectively.
  
  
  METHODS
  The visual acuity, optical coherence tomography, and multifocal electroretinography at baseline, 1 and 3 months after surgery.
  
  
  RESULTS
  The visual acuity at baseline, 1 and 3 months after surgery were not different between the small and large retinal debris groups. On multifocal electroretinography, there was no significant difference in response of the N1 amplitude, N1 latency, and P1 amplitude between the small and large retinal debris groups at baseline, and 1 and 3 months after surgery. However, compared to the small debris group, the P1 latencies in the foveal areas were delayed in the large debris group at 1 and 3 months (P = 0.020, P = 0.047, respectively). The central retinal thickness was significantly reduced in the large debris group, while the status of the photoreceptor line was not different based on optical coherence tomography between the small and large debris groups 3 months after surgery (P = 0.047).
  
  
  CONCLUSIONS
  Large amounts of retinal debris attached to the removed ILM did not affect visual acuity. However, the ultrastructural findings of Muller cell damage might be related to subtle macular dysfunction on multifocal electroretinography after surgery.
authors.affiliation: Hallym University Sacred Heart Hospital, Chuncheon, Korea. jiwoneye@hallym.or.kr
authors.forename: Ji W
authors.initials: JW
authors.lastname: Lim
authors.forename: Ha K
authors.initials: HK
authors.lastname: Kim
authors.forename: Doo Y
authors.initials: DY
authors.lastname: Cho
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001485:Basement Membrane / Q000648:ultrastructure*; D004596:Electroretinography; D019773:Epiretinal Membrane / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008266:Macula Lutea / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D041623:Tomography, Optical Coherence; D016896:Treatment Outcome; D014222:Triamcinolone Acetonide / Q000008:administration & dosage; D014792:Visual Acuity / Q000502:physiology; D014821:Vitrectomy; D014822:Vitreous Body / Q000187:drug effects
chemical_list: D014222:Triamcinolone Acetonide