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.
Schematic diagram of (a) the retinal and (b) the cerebral microvessel (not drawn to scale). Note the greater pericyte coverage on the retinal endothelium, and the smaller calibre of the retinal vessel. OBF, ocular blood flow; CBF, cerebral blood flow.
