[Cup-to-disc ratio asymmetry in adolescents].
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.
Campos
Maria Elizabete Jimenes de
ME
Assistente de Oftalmologia, Faculdade de Medicina de Catanduva, Faculdades Integradas Padre Albino, Catanduva, SP, Brasil.
Garcia
Denny Marcos
DM
Rodrigues
Maria de Lourdes Veronese
Mde L
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