Figure 1.
External photograph of case 1 of double-headed pterygia before (a) and 1 year after (b) surgery.
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.