title: Optic disc duplication or coloboma?
abstract: OBJECTIVE
  To describe lesions resembling optic disc duplication and highlight their unusual visual fields. The authors also report the first case of pseudo-duplication of the optic disc with overlying retinal nerve fibre layer.
  
  
  METHODS
  Retrospective, non-comparative review of case notes. Humphrey visual fields and OCT-3 imaging were performed.
  
  
  RESULTS
  All 11 cases represented peripapillary chorioretinal coloboma, some of which lie superior to the optic disc. A double blind spot or superior hemifield defects can be demonstrated by automated visual field testing.
  
  
  CONCLUSIONS
  Clinical examination and identification of bridging retinal vessels from the true optic disc to the second pseudo disc can usually avoid unnecessary invasive and non-invasive investigations.
authors.affiliation: Medical Retina, Moorfields Eye Hospital, City Road, London EC1V 2PD, UK. isniaz@yahoo.com
authors.forename: N
authors.initials: N
authors.lastname: Islam
authors.forename: J
authors.initials: J
authors.lastname: Best
authors.forename: J S
authors.initials: JS
authors.lastname: Mehta
authors.forename: S
authors.initials: S
authors.lastname: Sivakumar
authors.forename: G T
authors.initials: GT
authors.lastname: Plant
authors.forename: W F
authors.initials: WF
authors.lastname: Hoyt
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003103:Coloboma / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D005451:Fluorescein Angiography / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000002:abnormalities*; D012171:Retinal Vessels / Q000002:abnormalities; D012189:Retrospective Studies; D041623:Tomography, Optical Coherence