title: Prevalence of myopia and hyperopia in 6- to 72-month-old african american and Hispanic children: the multi-ethnic pediatric eye disease study.
abstract: OBJECTIVE
  To determine the age-, gender-, and ethnicity-specific prevalence of myopia and hyperopia in African American and Hispanic children aged 6 to 72 months.
  
  
  METHODS
  Population-based cross-sectional study.
  
  
  METHODS
  The Multi-Ethnic Pediatric Eye Disease Study is a population-based evaluation of the prevalence of vision disorders in children aged 6 to 72 months in Los Angeles County, California. Seventy-seven percent of eligible children completed a comprehensive eye examination. This report focuses on results from 2994 African American and 3030 Hispanic children.
  
  
  METHODS
  Eligible children in 44 census tracts were identified during an in-home interview and scheduled for a comprehensive eye examination and in-clinic interview. Cycloplegic autorefraction was used to determine refractive error.
  
  
  METHODS
  The proportion of children with spherical equivalent (SE) myopia </= -1.00 diopter (D) and SE hyperopia >/= +2.00 D in the worse eye. Prevalence of myopia and hyperopia is also reported using alternative threshold definitions.
  
  
  RESULTS
  Prevalence of myopia was higher in African American (6.6%) compared with Hispanic children (3.7%; P<0.001). Hispanics showed a higher prevalence of hyperopia than African American children (26.9% vs. 20.8% respectively, P<0.001). The prevalence of myopia showed a significant decreasing trend with age (P<0.001). Hyperopia prevalence reached a low point at approximately 24 months of age but increased and remained higher than that thereafter. No significant gender differences were found in the prevalence of refractive error for either ethnic group.
  
  
  CONCLUSIONS
  We observed ethnicity-related differences in both hyperopia and myopia prevalence in preschool children. The age-related decrease in myopia prevalence in preschool children could reflect early emmetropization and contrasts with the increase in myopia prevalence known to occur in older school-aged children. The limits of emmetropization are evident, however, in the persistently elevated prevalence of hyperopia beyond 24 months of age.
  
  
  BACKGROUND
  The author(s) have no proprietary or commercial interest in any materials discussed in this article.
mesh_terms: D001741:Black or African American / Q000208:ethnology*; D017677:Age Distribution; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D006630:Hispanic or Latino / Q000208:ethnology*; D006801:Humans; D006956:Hyperopia / Q000208:ethnology*; D007223:Infant; D015141:Los Angeles / Q000453:epidemiology; D008297:Male; D009216:Myopia / Q000208:ethnology*; D015995:Prevalence; D017678:Sex Distribution; D014786:Vision Disorders / Q000208:ethnology*; D014792:Visual Acuity