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.
Comparison of horizontal trefoil (Z3, 3) pre- and post-operatively. This figure depicts the changes in horizontal trefoil for each procedure, with pre-operative values in diagonal stripes and post-operative in solid colors. Red signifies LASIK, blue PRK, and black SMILE. Error bars denote standard error. PRK = photorefractive keratectomy, LASIK = laser-assisted in situ keratomileusis, SMILE = small incision lenticule extraction, HOAs = higher-order aberrations.
