Laser Procedure Could Eliminate Need for Reading Glasses
Aug. 4, 2000 -- For years, eye doctors have been treating
people who would otherwise need reading glasses by using two different
prescriptions of contact lenses -- correcting one of the patient's eyes for
close-up tasks and the other for distance vision.
Now they are taking this concept further and using laser
surgery to do the same thing. The idea may make some people a bit queasy, but
doctors say the key to success is giving patients a detailed explanation of
what to expect and plenty of support through the adjustment phase.
This type of correction is called monovision. It is used
to treat a condition called presbyopia, usually seen in people 45 and over, in
which the eyes gradually lose their ability to focus on nearby objects.
Refractive surgeons -- who specialize in correcting focusing errors such as
nearsightedness, farsightedness, astigmatism, or irregularly shaped corneas --
perform the procedure during standard laser eye surgery.
"In monovision, one eye is primarily used at a time for
ideal focus," refractive surgeon Andrew I. Caster writes in his book The
Eye Laser Miracle. "Both eyes are used all the time, but one is
generally primary, depending on the distance of the viewed object. Peripheral
vision and depth perception are usually normal."
Caster, who practices in Beverly Hills, Calif., tells WebMD
that a trial run with contact lenses is "by far the best thing" before
moving on to surgery. He estimates he has performed monovision correction in
more than 1,000 patients. "If a patient chooses monovision and is educated
about it in the proper way, they are almost always happy with it," he
Andrew Maxwell, a refractive surgeon at the California Eye
Institute in Fresno, Calif., estimates that he and his colleagues have
performed the procedure on 300 to 400 patients. "The patient satisfaction
level goes all the way from being extremely pleased to having a hard time
dealing with the difference between the two eyes," he says, but "in
general, the patient satisfaction is relatively high."
Like Caster, he says patients should try monovision with
contact lenses first to see how they adjust. "About 25% of our patients
were already living that way [with contact lenses], so they know if it's
something they want to do," he tells WebMD.
Maxwell routinely offers the surgery to patients over 35, but
he actually doesn't recommend having it done before age 40. "Think of the
eye as a camera. [To get a sharp image] the lens has to focus at a distance.
The eye must do that, also. As you get older, that is harder to do. Monovision
is a way of dealing with that."
Speaking at the World Refractive Symposium last month in Miami,
Maxwell presented his results with monovision surgery on 129 patients who had
the procedure last year. The patients ranged in age from 40 to their early 60s.
After the surgeries, Maxwell and his staff followed their progress for an
average of about three months.