Overcorrection makes an eye that was
nearsighted before surgery
farsighted (hyperopia) after surgery. Overcorrection
speeds up the start of
presbyopia. Most people who have overcorrection will
need reading glasses around age 40. Improvements in
surgical techniques are reducing the risk of overcorrection.
Surgery to correct overcorrection is possible. But it is hard to predict
how well it will work.
As our population ages, vision loss from eye diseases is increasing.
According to the National Eye Institute (NEI):
About 3.3 million Americans aged 40 or older are blind or have low vision. This is about 1 in every 28 people.
By 2020, that number could be 5.5 million -- a 60% increase.
NEI has identified the most common eye diseases in people over age 40 as:
Age-related macular degeneration
Diabetic eye disease
To catch eye conditions early and help...
With radial keratotomy (RK) surgery, the
number of people who are overcorrected or farsighted seems to increase as more
time (years) passes after the procedure. These changes over time are believed
to be caused by the
hyperopic shift. The hyperopic shift is less common in
people who have had laser surgery.
Primary Medical Reviewer
Kathleen Romito, MD - Family Medicine
Specialist Medical Reviewer
Christopher J. Rudnisky, MD, MPH, FRCSC - Ophthalmology
June 24, 2011
WebMD Medical Reference from Healthwise
June 24, 2011
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