Lasers are employed to correct eyesight by reshaping the cornea enabling people to have perfect or nearly perfect vision without glasses.
Isn't Science Amazing!!!
Sites and Sources
AOA:
http://www.aoanet.org
Brain Pop:
http://www.brainpop.com/health/senses/vision/
Lisa Trutkoff,Sight! The Eyes Have It,Creative Classroom(Jan/Feb 2001), 41.