Some problems associated with LASIK flap complications include:

Irregular astigmatism. This is caused by an unequally curved corneal surface. Irregular astigmatism also can occur from laser correction that is not centered properly on the eye or from irregular healing. Resulting symptoms may include double vision (diplopia) or "ghost images." In these cases, the eye may need re-treatment or enhancement surgery.

Epithelial ingrowth. This is when cells from the outer layer of the cornea (epithelium) grow under the flap after LASIK surgery. In most cases, epithelial ingrowth is self-limiting and causes no problems. But in some cases (reported to be 1 to 2 percent of LASIK procedures), symptoms of discomfort and/or blurred vision can occur, and additional surgery is needed to lift the flap and remove the epithelial cells.

Diffuse lamellar keratitis (DLK). Nicknamed "Sands of the Sahara," this is inflammation under the LASIK flap that may have several causes. Some inflammation of the cornea after LASIK surgery is normal. But if it is uncontrolled, as in DLK, it can interfere with healing and cause vision loss. If DLK occurs, it usually responds to therapies such as antibiotics and topical steroids. Also, the flap might need to be lifted and cleaned for removal of inflammatory cells and to prevent tissue damage.

Keratectasia or keratoconus. This is a very uncommon bulging of the eye's surface that can result when too much tissue is removed from the cornea during LASIK or when the cornea prior to LASIK is weak as evidenced from corneal topography mapping. Rarely does keratoconus develop after LASIK with no known risk factors.

Enhancement laser surgery is usually not suitable, and gas permeable contact lenses or corneal implants (Intacs) may be prescribed to hold the cornea in place, or a treatment called corneal collagen crosslinking may be performed to strengthen the cornea.

LASIK eye surgery has been performed on millions of people in the United States over the past 15 years or so, and experienced LASIK surgeons report that serious complication rates can be held below 1 percent. Common LASIK complications and side effects are listed below and most can be resolved with medical treatment or additional "enhancement" surgery.

Like any other surgery, however, there are potential risks, side effects and limitations you should be fully aware of before electing to undergo the procedure. Choosing a skilled and experienced LASIK eye surgeon can help mitigate these risks and enable you to achieve the best possible results from laser eye surgery.

One of the most important aspects of successful vision correction is that you're a suitable candidate. Your eye doctor will perform an advanced diagnostic eye exam to determine your suitability for LASIK surgery. He or she will evaluate: the shape and thickness of your cornea; pupil size; refractive errors; the moistness of your eyes (to check for dry eye syndrome; general health and medical history; and any medications you are taking.

Even if you are not a good candidate for LASIK, you might still be able to benefit from other vision correction surgery such as PRK, LASEK or implantable lenses.

LASIK and other types of laser eye surgery, such as PRK and LASEK, have an excellent safety profile and a very high success rate. They are designed to treat myopia (nearsightedness), hyperopia (farsightedness) and astigmatism, and can allow you to lead a life without glasses or contacts.

Sight-threatening complications such as complete or partial loss of vision from LASIK surgery are extremely rare, and many side effects and laser eye surgery complications can be resolved with additional surgery or medical treatment.

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