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.
Average relative peripheral refraction (RPR) in six groups of the four annular regions. In picture A, the x-axis shows rings with different eccentricity, and the y-axis in diopters shows the averaged refraction of the annular areas. In picture B, the x-axis shows the six groups, and the y-axis in diopters shows the averaged refraction of annular areas. The asterisks* represent statistical differences in linear test results in both Figs. (A) and (B).
