Loss of Vision
LASIK surgery can cause loss of vision or loss of best corrected vision.
Infection or irregular scarring can occur. Antibiotics, steroids, and other necessary treatment is used to treat the problem. Infection could even lead to the loss of the eye. Vision loss due to irregular scarring and astigmatism of the cornea can make wearing of glasses or contact lenses necessary. It is also possible that wearing of contact lenses after LASIK may not be possible.
Visual complications with LASIK include:
Glare or halos around lights which may not go away
Aniseikonia (difference in the image size between the two eyes)
Anisometropia (difference in the power or glass strength between the two eyes)
Fluctuation in vision during the day and from day to day
Photophobia (increased sensitivity to light which may be incapacitating for some time and may notcompletely go away).
These may affect your ability to work, drive, and judge distances. You should drive only when you know your vision is adequate.
Overcorrection and Undercorrection
Even though LASIK surgery has excellent results, it may not give you the desired vision results. Overcorrection can occur such that if you were nearsighted before surgery you may become farsighted needing correction and if farsighted become near sighted. Additional surgery can fine tune the under or over correction. Over time regression of the surgery may develop, resulting in blurred vision without correction.
Lasik can make dry eyes worse. Usually this resolves within a few months. In some cases it can be permanent. People with dry eyes prior to surgery may have exacerbation of their dry eyes. If you have dry eyes, you may not be a candidate for LASIK. Treatment of any dry eye problem before surgery can help.
Epithelial healing defects, corneal ulcer, corneal edema or swelling, hemorrhage, ptosis (eyelid drooping) , and retinal detachment.
Other corneal complications include damage to the corneal flap, flap decentration, wrinkles or striae in the corneal flap, and ectasia (corneal thinning). Sutures may be required to secure the corneal flap. Complications due to anesthesia and medications. Microkeratome or excimer laser malfunction are possible. Complications may require further surgery including a corneal transplant. This is not a complete list.