Fig. 3.
Unadjusted distribution of astigmatism, with subgroups: with the rule, against the rule and oblique astigmatism as a function of age group, shaded ribbons show 95% confidence intervals. Abbreviations: DC, dioptre cylinder.
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.