title: Progression of myopia and high myopia in the Early Treatment for Retinopathy of Prematurity study: findings at 4 to 6 years of age.
abstract: OBJECTIVE
  To report the prevalence of myopia and high myopia in children <6 years of age born preterm with birth weights <1251 g who developed high-risk prethreshold retinopathy of prematurity and who participated in the Early Treatment for Retinopathy of Prematurity trial.
  
  
  METHODS
  Surviving children from the cohort of 401 participants who had developed high-risk prethreshold ROP in one or both eyes underwent cycloplegic retinoscopy at 6 and 9 months corrected age and yearly between 2 and 6 years postnatal age. Eyes were randomized to receive treatment at high-risk prethreshold ROP or conventional management with treatment only if threshold ROP developed. Myopia (spherical equivalent ≥0.25 D) or high myopia (≥5.00 D) in eyes at 4-, 5-, and 6-year examinations was reported.
  
  
  RESULTS
  At ages 4, 5, and 6 years, there was no difference in the percentage of eyes with myopia (range, 64.8%-69.9%) and eyes with high myopia (range, 35.3%-39.4%) between earlier treated and conventionally managed eyes.
  
  
  CONCLUSIONS
  Approximately two-thirds of eyes with high-risk prethreshold ROP during the neonatal period are likely to be myopic into the preschool and early school years. In addition, the increase in the proportion of eyes with high myopia that had been observed in both earlier-treated and conventionally managed eyes between ages 6 months and 3 years does not continue between ages 3 and 6 years.
authors.affiliation: Division of Pediatric Ophthalmology, The Children's Hospital of Philadelphia and Scheie Eye Institute, University of Pennsylvania Health System, Philadelphia, Pennsylvania 19104, USA. quinn@email.chop.edu
authors.forename: Graham E
authors.initials: GE
authors.lastname: Quinn
authors.forename: Velma
authors.initials: V
authors.lastname: Dobson
authors.forename: Bradley V
authors.initials: BV
authors.lastname: Davitt
authors.forename: David K
authors.initials: DK
authors.lastname: Wallace
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Hardy
authors.forename: Betty
authors.initials: B
authors.lastname: Tung
authors.forename: Dejian
authors.initials: D
authors.lastname: Lai
authors.forename: William V
authors.initials: WV
authors.lastname: Good
mesh_terms: D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D018450:Disease Progression; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D053685:Laser Therapy / Q000379:methods; D008297:Male; D009216:Myopia / Q000453:epidemiology* / Q000209:etiology / Q000601:surgery; D015995:Prevalence; D012044:Regression Analysis; D012178:Retinopathy of Prematurity / Q000150:complications* / Q000601:surgery; D014481:United States / Q000453:epidemiology