Figure 1.
Corneal topography (tangent diagram) of an included subject as an example. x represents the center of corneal topography. Δ represents the corneal apex. ○ represents the pupil center.
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.