Radial and Astigmatic Keratotomy (RK/AK):
Surgery for Nearsightedness and Astigmatism
In nearsightedness (myopia) the cornea is often too steep and light
rays focus in front of the retina. Near vision is clear and distant
vision is blurry.
With astigmatism, the curve of the cornea is irregular and egg shaped,
causing light rays to focus at multiple points and resulting in blurred
or double vision at all distances.
Radial and Astigmatic Keratotomy
For over 30 years, a technique called radial keratotomy (RK) has been
used to reduce or eliminate low to moderate degrees of nearsightedness
and astigmatism in millions of people. Using a hand held diamond
blade, microscopic incisions are placed in a spoke-like or curvilinear
pattern around the outer portion of the cornea to reshape its curvture.
This reshaping allows light rays to focus properly on the retina,
reducing or eliminating nearsightedness and astigmatism. The incisions
are invisible to the naked eye and the procedure only takes minutes