Criteria for LASIK Eye Surgery

1. Your eyes must be healthy.

If you have any condition that can affect how your eyes respond to surgery or heal afterward, you must wait until that condition is resolved. Examples are chronic dry eyes, conjunctivitis and any injury. Your eye surgeon may want to prevent dry eyes after LASIK by giving you treatment such as prescription eye drops as a precaution.

Some conditions, such as cataracts that interfere with your vision, keratoconus and uncontrolled glaucoma, may disqualify you completely.

2. You must be an adult.

By law, certain procedures require you to be 18; others, 21. Younger patients can be treated as an exception.

3. You must have stable vision for at least a year.

Many young adults experience changes in their eyeglass and contact lens prescriptions in the teenage years. Vision stabilizes most often sometime in their 20s.
 
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 optometrist or ophthalmologist can tell you whether your prescription is stable.

4. If you are pregnant

If you are pregnant, certain hormonal changes will cause fluid levels in your body to rise. This can change the shape of your corneas, leading to changes in your vision. Surgery should not be performed until your hormones and vision have "normalized" after pregnancy. This could take a few months.
 
Dry eyes are often seen in pregnant women as well, and as mentioned above, you should postpone LASIK until your eyes are healthier.
 
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.

5. Degenerative or autoimmune diseases

Degenerative or autoimmune diseases may be disqualifiers, too. Some examples are Sjogren's syndrome, rheumatoid arthritis, type 1 diabetes, HIV, and AIDS.
 
Basically, if your body has any trouble with healing, your refractive surgery outcome may not be very good. Opinions vary among LASIK surgeons as to which diseases are automatic disqualifiers and which ones might pose acceptable risks in certain cases. 

6. Your prescription must be within certain limits.

For example, very high amounts of myopia, which would require removal of too much corneal tissue, may preclude LASIK or make another type of refractive surgery a better option, such as insertion of artificial lenses known as phakic IOLs or implantable lenses.