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.
Spherical equivalents measured preoperatively and postoperatively. The asterisk indicates a statistically significant difference between the laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) groups. POD = postoperative day.
