LASIK Surgery Boosts Vision Long Term
Study Shows Vision Correction From LASIK or PRK Lasts 10 Years After Surgery
Nov. 13, 2006 -- If you're considering laser surgery to correct your
nearsightedness, you can rest assured that the results will last long term.
A team of researchers from Spain tracked LASIK surgery (laser in-situ
keratomileusis) and its forerunner, PRK (photorefractive keratectomy). In both
procedures, the cornea is reshaped so that light entering the eye focuses on
the retina in the back of the eye, as it does in those with normal vision.
"Our findings are that both are safe after 10 years," and the visual
correction holds for the most part, says researcher Jorge Alio, MD, PhD, an
The study was presented at the joint annual meeting of the American Academy
of Ophthalmology and the Asia Pacific Academy of Ophthalmology.
The 10-Year Study
The study evaluated 200 eyes with nearsightedness (myopia) or with myopia
and astigmatism, an irregularly shaped cornea that blurs vision.
One hundred eyes were corrected with LASIK; the other 100 were corrected
with PRK. Both procedures use lasers.
On average, patients were 29 when the surgeries were done in 1995 and 1996,
The researchers measured each patient's vision 10 years later and evaluated
changes on the cornea, which reflect the stability of the procedure.
Most of the vision correction remained, he says. Ten years later, on
average, "they read the line [on the eye chart] above what they used to
read [immediately after the surgery]."
Put another way, he says, the vision of both groups regressed only
These patients were highly nearsighted to begin with, he says. After 10
years, the PRK patients' nearsightedness and the LASIK patients' vision
regressed only slightly, Alio says.
"This is a very good study," says James J. Salz, MD, a Los Angeles
ophthalmologist and long-time vision correction surgery researcher. The
results, he says, show that both eye procedures are "very stable"
While the patients got a bit more nearsighted -- and the LASIK patients a
bit more than the PRK patients -- the results held fairly well, he says.