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.
Box plots of epithelial thickness topographic variability (top) and range, defined as minimum minus maximum (bottom) for the two groups. Graphs include median level (⊗), average (⊕), 95% median confidence, and interquartile interval range boxes.
Abbreviation: KCN, keratoconus.
