Does laser eye surgery really improve eyesight?

Yes: Lasers are tools that your eye surgeon uses to treat many different eye problems. Laser done for nearsightedness and farsightedness should reduce your dependency on glasses or contact lenses. Laser eye surgery for glaucoma and retinal diseases is needed to stabilize and prevent deterioration of your ocular health.

Not really: Laser eye surgery can improve the vision so that you will see without glasses or contacts at the same level as the best you saw with contacts or glasses. If you have uncorrectable vision or vision possible only at a certain, that will be the best available with lasik.