title: Ten-Year Results of Home Vision-Screening Test in Children Aged 3-6 Years in Seoul, Korea.
abstract: OBJECTIVE
  To characterize the prevalence of refractive error and amblyopia among three- to six-year-old children during the period from 2002 to 2011.
  
  
  METHODS
  About 31,400 children annually (from 16,592 to 40,816) during the period from 2002 to 2011 were enrolled. The preschool vision screening was performed by the Korean Foundation for the Prevention of Blindness (KFPB) annually during a period that extended from March to September. We reviewed the KFPB annual report about the home vision-screening test as performed during the period from 2002 to 2011. Changes in the prevalence and types of refractive error, strabismus, and amblyopia that manifested throughout this period were analyzed.
  
  
  RESULTS
  The prevalence of refractive errors ranged from 1.10% in 2002 to 0.42% in 2011. The prevalence of hyperopia and myopia changed little throughout the 10-year study period. Myopia and hyperopia were equally common among the population examined (χ(2)-test, p = 0.137). The prevalence of anisometropia decreased over time. The annual prevalence of amblyopia ranged from 0.39% to 0.06%, while the overall prevalence of amblyopia dropped from 0.25% in 2002 to 0.06% in 2011. The prevalence of strabismus was highest in 2006 (0.30%) and had decreased by 0.06% in 2011. The type of strabismus showed no significant difference over time (χ(2)-test, p = 0.579).
  
  
  CONCLUSIONS
  The prevalence of amblyopia, refractive error, anisometropia, and strabismus was lower in 2011 than in early 2000. The prevalence of hyperopia and myopia as well as strabismus remained similar throughout the study period.
authors.affiliation: a Department of Ophthalmology , Kim's Eye Hospital , Seoul , Korea and.
authors.forename: Seong Hun
authors.initials: SH
authors.lastname: Jeong
authors.affiliation: a Department of Ophthalmology , Kim's Eye Hospital , Seoul , Korea and.|b Department of Ophthalmology , Konyang University College of Medicine , Daejeon , Korea.
authors.forename: Ungsoo Samuel
authors.initials: US
authors.lastname: Kim
mesh_terms: D000550:Amblyopia / Q000175:diagnosis / Q000453:epidemiology*; D000553:Ambulatory Care; D015858:Anisometropia / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D015995:Prevalence; D012030:Refractive Errors / Q000175:diagnosis / Q000453:epidemiology*; D056910:Republic of Korea / Q000453:epidemiology; D011795:Surveys and Questionnaires; D015351:Vision Screening / Q000295:instrumentation*; D014792:Visual Acuity
keywords: Amblyopia; epidemiology; preschool screening; refractive errors; strabismus