http://www.hhs.gov/news/press/1995pres/951215a.html
(Note: I have included only the last paragraph here. If you want to read the entire article, please go to the above website.)
"In 34 percent of "laser first" eyes the laser treatment caused a temporary jump in intraocular pressure for the first few days after treatment. Also, some 30 percent of the "laser first" eyes developed peripheral anterior synechiae -- adhesions that form when the iris sticks to part of the cornea. However, on all clinical measures the eyes with adhesions were the same as eyes with no adhesions.