title: 15-year outcomes following threshold retinopathy of prematurity: final results from the multicenter trial of cryotherapy for retinopathy of prematurity.
abstract: OBJECTIVE
  To report the ocular structure and visual acuity outcomes at age 15 years, and the incidence of retinal detachment between 10 and 15 years of age, for patients in the Multicenter Trial of Cryotherapy for Retinopathy of Prematurity (CRYO-ROP).
  
  
  METHODS
  Subjects were 254 survivors from 291 preterm children with birth weights less than 1251 g and severe (threshold) retinopathy of prematurity (ROP) in one or both eyes, who participated in the CRYO-ROP trial. At age 15 years, unfavorable ocular structure was posterior retinal fold or worse judged by study-certified ophthalmologists. Unfavorable distance visual acuity was 20/200 or worse measured by study-certified testers using Early Treatment of Diabetic Retinopathy Study recognition acuity charts.
  
  
  RESULTS
  Thirty percent of treated eyes and 51.9% of control eyes (P<.001) had unfavorable structural outcomes. Between 10 and 15 years of age, new retinal folds, detachments, or obscuring of the view of the posterior pole occurred in 4.5% of treated and 7.7% of control eyes. Unfavorable visual acuity outcomes were found in 44.7% of treated and 64.3% of control eyes (P<.001).
  
  
  CONCLUSIONS
  The benefit of cryotherapy for treatment of threshold ROP, for both structure and visual function, was maintained across 15 years of follow-up. New retinal detachments, even in eyes with relatively good structural findings at age 10 years, suggest value in long-term, regular follow-up of eyes that experience threshold ROP.
authors.affiliation: Casey Eye Institute, Oregon Health & Science University, Portland 97239-4197, USA. palmere@ohsu.edu
authors.forename: Earl A
authors.initials: EA
authors.lastname: Palmer
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Hardy
authors.forename: Velma
authors.initials: V
authors.lastname: Dobson
authors.forename: Dale L
authors.initials: DL
authors.lastname: Phelps
authors.forename: Graham E
authors.initials: GE
authors.lastname: Quinn
authors.forename: C Gail
authors.initials: CG
authors.lastname: Summers
authors.forename: Carol P
authors.initials: CP
authors.lastname: Krom
authors.forename: Betty
authors.initials: B
authors.lastname: Tung
mesh_terms: D000293:Adolescent; D003430:Cross-Sectional Studies; D003452:Cryosurgery; D005500:Follow-Up Studies; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D019102:Infant, Very Low Birth Weight; D009887:Ophthalmoscopy; D011183:Postoperative Complications; D012164:Retinal Diseases / Q000175:diagnosis / Q000209:etiology; D012178:Retinopathy of Prematurity / Q000175:diagnosis / Q000601:surgery*; D016896:Treatment Outcome; D014786:Vision Disorders / Q000175:diagnosis / Q000209:etiology; D014792:Visual Acuity