There are two main parts to LASIK eye surgery: creating the flap and reshaping the cornea. To create the flap, doctor will use a suction device. After the surgery there will be discomfort for about 10-12 hours. The discomfort is due to the healing process. Similar to how a scab itches when its healing and how a cough develops when youre clearing out a head cold, theres some irritation during the very first few hours of healing. This irritation goes away as the eyes heal.