What corneal rings
are
 Corneal ring segments are the first FDA-approved
non-laser surgical treatment in the U.S. for the correction of
mild nearsightedness (myopia). An estimated 20 million U.S.
adults have mild myopia, from -1.0 to -3.0 diopters, which is
the treatment range for corneal rings. The rings are composed
of the same material (PMMA) that has been safely used for
nearly 50 years to treat patients with cataracts.
What the procedure is like
The rings are designed to remain permanently in the
eye, yet they can also be removed or replaced. The procedure
is performed in an outpatient setting using drops to numb your
eye. It takes approximately 15 minutes to place the rings in
your eye. The total procedure for one eye, including
preparation time, is usually completed in less than one hour.
How the rings correct vision
Corneal rings are surgically placed through a tiny
incision that is made on the cornea. Once in place, the two arcs
flatten the cornea so that light rays can properly focus on the
retina. Since the rings are inserted in the outer edge of the
cornea, the center of the cornea remains untouched.
Benefits
Unlike other types of refractive surgery, corneal rings
can be surgically removed or replaced, and the procedure
preserves the central portion of the cornea, which is most
important for your vision.
Risks
As with any surgical procedure, there are certain risks
and complications. It is important to discuss these risks with
your doctor before you make your decision. Some of the post
surgical symptoms include sensitivity to light, burning
sensation, halos and difficulty with night vision.
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