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There are some risks associated with LASIK eye surgery. Because it is a very technical surgery, problems can occur when the procedure is not performed as precisely as required and patients may experience issues with the corneal flap, such as infection or excess tears. If the cornea is not treated evenly, the patient may experience astigmatism. Other common side effects include: glare, halos and starbursts within the eyes, double vision and poor vision in dim light. These side effects might disappear within a few weeks following surgery, although they might persist for months or years.
Some patients may also experience undercorrection or overcorrection. Undercorrection is easy to fix, and patients simply require an additional enhancement procedure. Overcorrection can be more difficult to fix than under correction.
In rare cases, LASIK eye surgery can cause a loss of your “best vision”, i.e. your vision using contact lenses or glasses. A common side effect of LASIK eye surgery is the sensation of dry eyes and these can be treated very simply with eye drops.