Figure 9.
The mean degree of discomfort after PRK as graded using the digital analog scale (DAS) and the facial expression scale (FES). Note the rapid decrease in discomfort in the first 2 days.
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.