Patients are given a topical anesthetic (eye drops) to numb the eye, so they experience
no pain during the procedure. When the surgeon applies the vacuum ring, the patient
experiences a sensation of pressure just before his or her vision fades for a few
seconds. The microkeratome - the instrument the surgeon uses to create the flap
- and the laser do not cause any pain or discomfort. For several hours after the
procedure, many patients describe a mild burning sensation, such as after opening
the eyes while swimming in chlorinated water. Therefore, taking a nap for the first
2 to 3 hours after LASIK is encouraged. After the first few hours, this uncomfortable
feeling usually subsides.