title: The prevalence of anisometropia aniso-astigmatism and amblyopia in neurofibromatosis type 1.
abstract: OBJECTIVE
  The purpose of this study was to document the prevalence of anisometropia, anisoastigmatism, and anisometropic amblyopia in patients with neurofibromatosis-1 (NF1) and to compare it with that in age- and sex-matched controls.
  
  
  METHODS
  Fifty patients with NF1 and 150 age- and sex-matched controls were examined in this study. Cycloplegic autorefraction was attempted on all patients <16 years old and without cycloplegia on patients >16 years old. Anisometropia was defined as absolute interocular difference of spherical equivalent more than or equal to 1 D. Aniso-astigmatism was defined as interocular difference of refractive astigmatism of more than or equal to 1 D. Amblyopia was defined as two-line decrease in Snellen acuity between the two eyes.
  
  
  RESULTS
  The overall prevalence of anisometropia, aniso-astigmatism, and amblyopia in patients with NF1 was 16%, 20%, and 10%, respectively, and they were all significantly higher than in the controls. The amblyopia was either moderate or severe in nature and all affected patients had significant astigmatism (>2.5 D) in the amblyopic eye.
  
  
  CONCLUSIONS
  NF1 is a risk factor for anisometropia, aniso-astigmatism, and aniso-astigmatic amblyopia and screening patients with NF1 for refractive errors before age 3 will help to detect patients at risk of amblyopia and give them proper treatment.
authors.affiliation: Göztepe Research and Training Hospital, Department of Ophthalmology, Istanbul, Turkey. aardagil@gmail.com
authors.forename: Aylin
authors.initials: A
authors.lastname: Ardagil
authors.forename: Sevil
authors.initials: S
authors.lastname: Yaylali
authors.forename: Hasan
authors.initials: H
authors.lastname: Erbil
authors.forename: Ali
authors.initials: A
authors.lastname: Olgun
authors.forename: Zeki
authors.initials: Z
authors.lastname: Aslan
authors.forename: Ayse
authors.initials: A
authors.lastname: Dolar
mesh_terms: D000293:Adolescent; D000328:Adult; D000550:Amblyopia / Q000453:epidemiology*; D015858:Anisometropia / Q000453:epidemiology*; D001251:Astigmatism / Q000453:epidemiology*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D009456:Neurofibromatosis 1 / Q000453:epidemiology*; D015995:Prevalence; D012307:Risk Factors; D014421:Turkey / Q000453:epidemiology; D055815:Young Adult