A decentered ablation is a complication of LASIK eye surgery that occurs when the laser treatment is not properly centered over the pupil. Laser ablations that are off-center by as little as 0.5mm can cause visual symptoms, including glare and halos, ghost images, and blurred vision.

Corneal ectasia is one of the most devastating complications after LASIK surgery. Ectasia is considered in patients who developed increasing myopia, with or without increasing astigmatism, loss of uncorrected visual acuity, often loss of best-corrected visual acuity, with keratometric steepening.

Persistent glare and halos after LASIK have several possible causes. The most common is residual refractive error: Remaining myopia, hyperopia, or astigmatism from an over-response or under-response of your cornea to the treatment (causing an unwanted under-correction or over-correction.)

Patients undergoing LASIK procedures display an increase of halo phenomena around lights in night vision conditions, even when the results of the surgery are considered entirely satisfactory according to current international standards of predictability, efficacy and safety.

One of the most common complications of LASIK or other types of refractive surgery is dry eye. Many patients experience some degree of dry eye after surgery. Sometimes this is temporary and sometimes it can be severe and remain a permanent lifelong condition.