title: [Cup-to-disc ratio asymmetry in adolescents].
abstract: OBJECTIVE
  To determine the frequency of asymmetries greater than 0.2 in the cup-to-disc ratio of a population of adolescents.
  
  
  METHODS
  Fundus photographs of both eyes of 123 adolescents were digitized at the resolution of 300 pixels per inch (300 dpi), 8 bits, with a RBG color pattern. The measurements were performed using the Image J software, version 1.42, developed by the National Institutes of Health (NIH), Java platform version 1.6.
  
  
  RESULTS
  The values of the differences in the cup-to-disc ratio between the two eyes of the same individual ranged from 0 to 0.30. The mean difference was 0.07, the median 0.06 and the standard deviation 0.05. About 54.4% of the studied population had asymmetries up to 0.06 and 79.7% had asymmetries up to 0.1. Two individuals presented asymmetries of more than 0.2, corresponding to 1.63% of the evaluated subjects.
  
  
  CONCLUSIONS
  The frequency of asymmetries in the group of adolescents studied was similar to that detected in studies of the normal adult population.
authors: Assistente de Oftalmologia, Faculdade de Medicina de Catanduva, Faculdades Integradas Padre Albino, Catanduva, SP, Brasil.
authors: Maria Elizabete Jimenes de
authors: ME
authors: Campos
authors: Denny Marcos
authors: DM
authors: Garcia
authors: Maria de Lourdes Veronese
authors: Mde L
authors: Rodrigues
mesh_terms: D000293:Adolescent; D003430:Cross-Sectional Studies; D005260:Female; D005654:Fundus Oculi; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008297:Male; D009898:Optic Disk / Q000033:anatomy & histology*; D012016:Reference Values