It takes around 10 to 15 minutes per eye, with the treatment itself lasting around 20 seconds per eye. The rest of the time is devoted to setting up the operating field, checking and aligning the eye with the laser, etc. Surgery under local anaesthetic is not painful. Some tingling may be felt, and the instrument that prevents blinking (the eyelid retractor) is sometimes a source of a little discomfort in the event of "tightness".