LASIK Success Criteria
9 Essential Guidelines
A successful LASIK procedure is determined largely by whether you meet certain patient criteria and if laser eye surgery is right for you.
LASIK and PRK outcomes are almost always favorable, however not everyone is a good candidate for vision correction surgery.
The following laser eye surgery checklist is a good start to help you determine if LASIK or PRK is right for you.
1. Your Eyes Must Be Healthy
If you have any condition that can affect how your eyes respond to surgery or heal afterwards, you must wait until that condition is resolved. Examples are dry eye syndrome, conjunctivitis (pink eye), infection and any injury to the eye.
If you have persistent dry eyes, where you do not produce enough tears to keep your eyes lubricated and healthy, LASIK surgery may aggravate this condition. Common symptoms of dry eyes include burning or stinging, a "gritty" sensation in the eye, reduced tolerance to wind, intermittent blurry vision, and even excessive tears in some cases.
Your eye doctor can detect whether you have dry eyes during your pre-operative exam and successfully treat dry eye before proceeding with laser eye surgery. Possible treatments include artificial tears, punctal plugs, medicated eye drops, flaxseed or fish oil supplements, or a combination of these approaches.
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2. Your Cornea Must Have Sufficient Thickness
Most refractive procedures improve visual acuity by reshaping the front surface of the eye (cornea). Performing laser eye surgery on a cornea that is too thin or has a surface that is extremely irregular and misshapen (for example, if you suffer from keratoconus) will compromise results and can impair your vision.
3. Your Pupils Must Not Be Overly Large
If your pupils are naturally large, you may be at increased risk of side effects such as halos, glares and starbursts in low light, especially when driving at night.
4. Your Prescription Must Be Within Certain Limits
Results of LASIK surgery for the treatment of very high refractive errors are less predictable and may not be worth the cost and potential risks.
In addition, very high amounts of myopia, for example, would require removal of too much corneal tissue and put you at increased risk of vision complications.
If you have a severe refractive error, another type of vision correction surgery may be a better option, such as phakic IOL implantable lenses or refractive lens exchange.
5. You Must Be Over a Certain Age
Certain procedures require you to be 18; others, 21. Patients younger than these ages can be treated as an exception at the discretion of the LASIK surgeon with permission from the patient's parent(s) or guardian.
Generally there is no upper age limit to laser eye surgery. However, it is important to note that once you hit your 40s, you may still need reading glasses to correct near vision due to a normal, age-related condition called presbyopia.
Keep in mind that women are more at risk for dry eyes after menopause, and men have a greater risk for dry eyes later in life as well. As noted above, a dry eye condition should be resolved before LASIK surgery.
6. You Must Have Stable Vision for at Least a Year
Teenagers and many young adults often experience changes in their contact lens prescription and eyeglass prescription from year to year. It's important for refractive errors to be stable for at least 12 months before undergoing LASIK or other refractive surgery.
Usually it is nearsightedness that gradually becomes worse, but there may be other changes as well.
Younger people are not good candidates until their eyes have "settled down" into one prescription. Your eye care practitioner can tell you whether your prescription is stable.
7. You Must Generally Be In Good Health
Contraindications to laser eye surgery may include certain uncontrolled degenerative or autoimmune diseases such as Sjogren's syndrome, rheumatoid arthritis, type 1 diabetes, HIV and AIDS.
Basically, if your body has any trouble with healing, your LASIK surgery outcome may be unsatisfactory.
Opinions vary among LASIK surgeons regarding which diseases are automatic disqualifiers and which ones might pose acceptable risks in certain cases.
Also, certain medications can exacerbate the risks of laser eye surgery. Steroids and immunosuppressants may interfere with post-operative healing, and some medications such as isotretinoin (Accutane) may increase the chance and/or severity of dry eye syndrome.
8. If You Are Pregnant, You Should Delay Surgery
The LASIK procedure is not suitable if you are pregnant or nursing. Hormonal changes can alter the shape of your cornea, leading to temporary changes in your vision.
Surgery should not be performed until your hormones and vision have returned to normal after pregnancy. This could take a few months.
Pregnant women often have dry eyes, which is another reason you may need to postpone LASIK until a few months after pregnancy. In addition, some medications that would normally be used before or after surgery to promote healing (such as antibiotics and steroids) may be risky for your baby, whether unborn or nursing.
9. Do You Have Realistic Expectations?
An experienced LASIK eye surgeon will advise you whether you are a good candidate for laser eye surgery, or if another type of refractive surgery may be more appropriate.
It's important to tell your surgeon all pertinent information relating to your health and medical history to ensure you achieve the best possible results.
[Page updated October 2012]
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