Cup-to-disc ratios of Aboriginal and non-Aboriginal youths

Clin Exp Optom. 2006 Sep;89(5):306-9. doi: 10.1111/j.1444-0938.2006.00047.x.


Background: The determination of the cup-to-disc ratio (C/D) is a standard procedure in an eye examination and is pivotal in the diagnosis of glaucoma. Determining the size of the C/D ratios of different races of young people may be helpful in determining the genetically predetermined differences between Aboriginal and non-Aboriginal people. The aim of this study was to determine whether there is a statistically significant difference in the average C/D ratios of young Aboriginal and non-Aboriginal people.

Methods: The overall average C/D ratios of 104 subjects aged between five and 23 years were compared for two age-matched groups by stereoscopic indirect ophthalmoscopy. Differences between the overall average C/D ratios of the two groups were assessed for significance using an unpaired Student's t test.

Results: While the range of C/D ratios within each group was the same (zero to 0.7), there was a statistical difference (p < 0.001) between the overall average C/D ratios of the Aboriginal (C/D = 0.295) and non-Aboriginal (C/D = 0.159) groups.

Conclusions: Results indicating a difference between the overall average C/D ratios between Aboriginal and non-Aboriginal young people may have implications for initial assessments of glaucoma in patients of any age.

Publication types

  • Comparative Study

MeSH terms

  • Adolescent
  • Adult
  • Anthropometry
  • Australia / epidemiology
  • Child
  • Child, Preschool
  • Eye / embryology*
  • Female
  • Glaucoma / diagnosis
  • Humans
  • Male
  • Native Hawaiian or Other Pacific Islander / statistics & numerical data*
  • Optic Disk / anatomy & histology*
  • Rural Population / statistics & numerical data*