Although LASIK enjoys a high success rate and is a very popular procedure, it is not for everyone. For example, to be a suitable candidate for the surgery, you should not be suffering from any active eye diseases such as cataract, glaucoma, retinal detachment or keratoconus. If you suffer from severe dry eyes or a past ocular herpes infection, you may also not be a good candidate. Additionally, below is a list of other factors that make you an unsuitable candidate:
You are below the age of 18.
Your refractive error can still fluctuate when you are young. It is recommended that you wait till you are over 18, or, in some countries, 21.
You are pregnant or breastfeeding.
Much like being under-aged, during your pregnancy or breastfeeding period, the level of your refractive error might also fluctuate. Lasik cannot be done if you are pregnant, please wait till the pregnancy or breastfeeding is over.
Recent change in your contact lens or glasses prescription.
Recent changes in contact lens or glasses prescription mean there is a refractive instability. By recent, it could mean within the most recent 1-2 years.
This could be caused by diseases such as diabetes.
Medication that might affect vision.
If you’re currently taking medication for any type of disease or condition, please ensure that you talk to your eye doctor about it and see if the medication has the potential to affect your vision. Additionally, you should not be taking certain prescription drugs like oral prednisolone. These conditions may increase the risk of serious complications.
If anyone in your family has ever had a cornea disorder, diabetes or autoimmune disorder, you should mention that to your doctor for a better, and thorough evaluation to manage the risks of taking a LASIK surgery.
Persons with an obsessive nature or who have great difficulty finding glasses to suit their eyesight are also advised against treatment.
Before you decide to take the LASIK surgery, your doctor should screen you for the following conditions or risk factors and give you a detailed evaluation to confirm if you’re a suitable candidate:
Eyelid inflammation with eyelash crusting. This could increase the cornea infection or inflammation after your LASIK surgery.
Related: Am I a suitable candidate?
This should be done in a dark room. Patients who are younger or on certain medications are more likely to have large pupils in dim lighting. This could be causing symptoms like glare, halos, starbursts, and ghost images (double vision) after the surgery, and it could go as bad as becoming unable to drive a car at night or in foggy environment.
The LASIK surgery, like most refractive surgeries, reshapes the cornea to correct the eye’s focusing and improve the vision. A cornea that is too thin might cause blinding complications after a refractive surgery.
Previous refractive surgery
Additional refractive surgeries are generally not recommended. Although it varies case by case. If you are considering having more refractive surgeries after your last one, please make sure that you have consulted with your doctor and have worked together to conduct a careful evaluation and consideration.
If you have dry eyes syndrome, or have a history of dry eyes, a LASIK surgery has the tendency to make your eye even drier.
When is LASIK not for me? – U.S Food and Drug Administration http://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/SurgeryandLifeSupport/LASIK/ucm061366.htm