Your eye care practitioner can help you decide but here are some general guidelines: You must have healthy eyes “no glaucoma” infection cataracts severe dry eye or any other condition that would affect postoperative healing. You must be an adult: age 21 or older (with some exceptions). Your vision must be stable for at least a year before surgery. If you’re pregnant or nursing your hormonal levels can affect the shape of your eye. You will need to wait until your hormones are back to normal levels. You cannot have a degenerative or autoimmune disease since this would affect healing.