This question is answered very differently between practices. The answers I’ve heard have been as long as six weeks out of contacts before they’ll even see you to as short as three days before the procedure. The reason, in my opinion, is dogma, or historical dictates that have not kept up with actual practice. I’ve been performing LASIK and PRK full time since 1999 and have observed these practices evolve in some places and not in those who don’t directly practice, or who have never questioned the practice of these onerous dictates.
Our policy is:
- Soft contacts: please wear only glasses for at least three days before your procedure
- Soft toric: please wear only glasses for at least three days before your procedure
- RGP/Hard contacts: *see below
The reasons to be out of contacts are to reduce or eliminate any effects of the contact lenses on your eyes. These effects may be very short term: reducing the bacterial CFUs (colony forming units) on your lids, and ocular surface. This reduction of bacteria occurs in about two days; and medium term: the dogma/conventional wisdom is that soft contacts can mold or change the shape of your eyes and therefore your prescription.
I believe this is absolutely true if you wear Rigid Gas Permeable (RGP) lenses (more below), but not true of soft or soft toric (astigmatism correcting) contact lenses. At SHARPEVISION, we ALWAYS recheck your prescription very carefully on the day of your procedure. The reason for this is to confirm all our measurements from the day of your exam. Now here’s what I think is the cool part: we find slight variations in prescription on most people. That is, (almost) anything you measure in the body will fluctuate a small amount (height, weight, temperature, etc.) but the fluctuations are present whether you’ve worn contacts or not. So our results are the same excellent results in everyone.
*Caveat! RGP (hard/inflexible contacts) are an exception! RGP lenses absolutely do mold the shape of your eye. This is where the SHARPEVISION method makes the process as easy as possible while ensuring excellent outcomes. We have our patients come in for a free comprehensive exam even if they’re wearing their RGP lenses. We can tell them they’re a candidate based on their prescription, corneal thickness, and all the other elements of the exam. If they’re not LASIK candidates, they don’t have to undergo the burden of not wearing their contacts for a long time. We also discuss the effect of RGP lenses on their eyes. We require these patients to wear glasses only (occasionally switch to soft contacts) for a minimum of three weeks, then have them come for a recheck of their prescription. This is where the majority of any change in prescription will be determined. Then we schedule their procedure at least two weeks after that, and check the prescription again a third time very carefully. If we measure more astigmatism, or a significant change in prescription, we postpone their procedure and recheck again in at least two more weeks. I can only recall doing this one time. This protocol has worked perfectly in my opinion. It allows us to monitor the stability of the prescription over time.
PS: If you don’t have any glasses to wear before the procedure, we frequently write a prescription for temporary glasses that you can get online for under $20.