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 of retinal hemorrhage assessment tool. Retina is divided into four zones: A (yellow circle), B (green circle), C (black circle), and D (peripheral retina beyond zone C). The nasal edge of zone B is tangential to the nasal edge of zone A. The edges of the midperipheral zone C run approximately through the vortex veins (yellow dots). The x represents the fovea.
