Know What Makes You a Poor Candidate April 2, 2002 at 4:17 PM EST - Updated June 29 at 8:00 PM Career impact - does your job prohibit refractive surgery? Cost - can you really afford this procedure? Medical conditions - e.g., do you have an autoimmune disease or other major illness? Do you have a chronic illness that might slow or alter healing? Eye conditions - do you have or have you ever had any problems with your eyes other than needing glasses or contacts? Medications - do you take steroids or other drugs that might prevent healing? Stable refraction - has your prescription changed in the last year? High or Low refractive error - do you use glasses/contacts only some of the time? Do you need an unusually strong prescription? Pupil size - are your pupils extra large in dim conditions? Corneal thickness - do you have thin corneas? Copyright U.S. Food and Drug Administration Know the risks and procedure limitations?