Could you describe the surgical options?
Surgical options nowadays are basically laser vision correction. Years ago there was an option called radial keratotomy where very fine slits were made in the cornea to change the shape. It, in effect, improved vision but it also weakened the cornea. Laser eye surgery is safe and it's effective. It's a procedure, and a procedure can always have problems, but it's one of the most successful procedures we now perform.
In what percentage of people does it work?
Given the whole spectrum of people with all different prescriptions, about 95 percent of people would be able to pass a driver's vision test without glasses after having the procedure.
Are there some people in whom it shouldn't be used?
Yes. You have to be very careful in evaluating patients to make sure that they qualify for laser surgery. One of the things to evaluate is the pupil size in the dark. If your pupils get too big in the dark, with light coming in-especially when you're driving at night-light can hit the edge of the laser zone and cause a lot of glare as it goes into the pupil. Some people have a thin cornea, and so some types of laser surgery are not good because the laser does remove a small portion of the cornea in the front of the eye. That's how it works. You have to have enough left over for the health of the eye. Some people have weaknesses or scar tissue in the cornea and surgery may not be advisable.
So not everybody can just walk in and get this surgery.
No. It has to be carefully evaluated. Young people whose eyes are still changing should not have surgery done because you don't want to have this done twice if you can help it. You have to wait until your eyes have stopped changing.
Does vision have to be "bad enough" to a certain extent to get this procedure done?
It's generally for people who would have to wear their glasses or contact lenses all the time in order to see. For someone who is very, very slightly nearsighted, it doesn't really pay to do the procedure. It doesn't mean that you have to be severely nearsighted to have this done. People have this done at all different spectrums. But at least the risk/benefit ratio that we talk about should be in effect.