Up to 20 percent of people interested in undergoing LASIK surgery don't qualify for the procedure. There are a number of factors that can disqualify you from having the procedure, such as prescription instability, taking certain medications, and pre-existing eye diseases and conditions. Hormonal fluctuations during pregnancy and breastfeeding can cause changes in vision and corrective prescribing. Therefore, mothers considering LASIK surgery should wait 3 to 6 months or more after weaning to allow their prescription to stabilize.
Certain prescription medications can interfere with LASIK results. For example, some steroids can delay healing and decrease optimal results, while acne medications can cause significant dry eyes, which can increase the chance of corneal scarring after LASIK. Not everyone is a good candidate for LASIK eye surgery. Autoimmune diseases that cause dry eyes and cannot be cured well with surgery may disqualify you from the procedure.
Other conditions such as diabetes and glaucoma can also affect Lasik results. In general, the change in prescription must be significant to be a disqualification for LASIK surgery.