title: Radial optic neurotomy for central retinal vein occlusion: results of the Pan-American Collaborative Retina Study Group (PACORES).
abstract: OBJECTIVE
  To evaluate the complications after radial optic neurotomy (RON) for central retinal vein occlusion (CRVO).
  
  
  METHODS
  Seventy-three consecutive patients (73 eyes) with CRVO who were treated with RON participated in a retrospective, uncontrolled, interventional, multicenter case series at 7 institutions from 6 countries.
  
  
  RESULTS
  In the ischemic CRVO group (n = 53), 32% of eyes had an improvement in best-corrected visual acuity (BCVA) (mean, 5.5 lines), 35.8% had worse BCVA (mean, 6.4 lines), and 32% had BCVA that remained the same after RON. In the nonischemic CRVO group (n = 20), 50% of eyes had an improvement in BCVA (mean, 6.5 lines), 15% had worse BCVA (mean, 4.3 lines), and 35% had BCVA that remained the same after RON. Complications occurred in 71.2% of cases, including cataract in 17 eyes (23.2%), vitreous hemorrhage in 16 eyes (20.5%), persistent macular edema in 15 eyes (20.5%), neovascular glaucoma in 7 eyes (9.5%), anterior segment neovascularization in 5 eyes (6.8%), retinal detachment in 3 eyes (4.1%), and phthisis bulbi, choroidovitreal neovascularization, central retinal artery perforation, and optic nerve atrophy in 1 eye (1.3%) each.
  
  
  CONCLUSIONS
  RON may improve visual acuity in some eyes with CRVO, but complications are common. In our series, surgery by itself did not seem to improve the outcome of CRVO when compared with its natural history.
authors.affiliation: Retina and Vitreous Service, Clinica Oftalmológica Centro Caracas, Venezuela. arevalojf2020@gmail.com
authors.forename: J Fernando
authors.initials: JF
authors.lastname: Arevalo
authors.forename: Reinaldo A
authors.initials: RA
authors.lastname: Garcia
authors.forename: Lihteh
authors.initials: L
authors.lastname: Wu
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Rodriguez
authors.forename: Jose
authors.initials: J
authors.lastname: Dalma-Weiszhausz
authors.forename: Hugo
authors.initials: H
authors.lastname: Quiroz-Mercado
authors.forename: Virgilio
authors.initials: V
authors.lastname: Morales-Canton
authors.forename: Jose A
authors.initials: JA
authors.lastname: Roca
authors.forename: Maria H
authors.initials: MH
authors.lastname: Berrocal
authors.forename: Federico
authors.initials: F
authors.lastname: Graue-Wiechers
authors.forename: Violeta
authors.initials: V
authors.lastname: Robledo
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000009:adverse effects* / Q000379:methods*; D011183:Postoperative Complications / Q000453:epidemiology / Q000503:physiopathology; D012170:Retinal Vein Occlusion / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D012189:Retrospective Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome; D014792:Visual Acuity