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.
Distribution of the within-subject test–retest SD for optic nerve head (left) and macula (right), and vessel density (upper) and thickness (lower). cpCD, circumpapillary capillary density; cpRNFL, circumpapillary retinal nerve fibre layer; pfVD, parafoveal vessel density; pfGCC, parafoveal ganglion cell complex.
