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Why are my Lasik results not perfect?

By , About.com Guide

Updated July 02, 2010

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Question: Why are my Lasik results not perfect?
I had Lasik eye surgery, but my vision is not perfect. What went wrong?
Answer: Even if your Lasik procedure runs smoothly and nothing technically goes wrong, your vision results after Lasik may not be perfect.

Lasik Healing Rate

Lasik surgery involves reshaping your cornea to eliminate or reduce your need for a prescription. When you have Lasik, small amounts of tissue are removed from your cornea, resulting in a different shape. Everyone heals differently after surgery, some at faster rates than others. Depending on how your eyes heal, your vision may settle in an imperfect manner. You may be left with a small amount of nearsightedness, farsightedness or astigmatism that can cause distance, intermediate or near blur.

Night Vision Problems After Lasik

Even if Lasik corrects your vision, you may be left with slight irregularities in the cornea that produce night vision problems. Sensitivity to contrast may cause you to see glare and halos while driving at night. These irregularities are often measured with special devices such as wavefront abberometers and corneal topographers.

Lasik Expectations

If your vision results are less than perfect after Lasik, maybe your expectations were too high. Even though Lasik surgeons are trained to educate their patients about negative outcomes, sometimes high expectations create a false hope for perfect vision. True, some people do dump their eyeglasses after Lasik, but some people don't.

What Can You Do?

Depending on both your own and your surgeon’s comfort level, another Lasik procedure may be performed to attempt to enhance your vision and bring it into sharper focus. Would you be willing to undergo the entire procedure a second time? Perhaps your surgeon could "fine tune" your procedure, making the results more favorable. Keep in mind, however, that a second procedure may not be possible, depending on the shape or thickness of your cornea.

If a second procedure is not possible, it is usually safe to wear contact lenses after your eye has healed completely. If your problem is simply that your vision is not as sharp as you would like it to be, your doctor can fit you with the same soft, disposable lenses that you may have worn before the procedure.

However, depending on the problem, you may need to be fitted with special post-surgery contact lenses to fit your newly shaped corneas. Rigid gas permeable lenses (RGPs) may be used to reduce tiny imperfections or irregularities in the cornea. Rigid lenses hold their shape and do not conform to the shape of the eye as soft lenses do. The tear layer underneath a rigid lens fills in the microscopic gaps in the surface of the cornea, producing a new smoother surface that light can refract through to the back of your eye.

Source:

Azar, Dimitri T. and Douglas D. Koch. "LASIK: Fundamentals, Surgical Techniques, and Complications." Marcel Dekker, Inc., pp 277-280. Copyright 2003.

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