Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Histogram showing the correlation between neuroretinal rim area and optic disc area in a randomly selected sample of 70 subjects from Vellore, Tamil Nadu. (Correlation coefficient r = 0.85; equation of the regression line: neuroretinal rim area (mm2) = 0.48 × optic disc area (mm2) + 0.37; p <0.001.)
