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.
In steps 2–6 of the web-based application, the user draws a best fit circle around the pupillary ruff (purple circle), collarette (blue circle) and iris (red circle). This allows the program to identify the pupillary zone (bounded by the blue and purple circles) and the ciliary zone (bounded by the blue and red circles).
