Other Procedures    • Photorefractive Keratectomy (PRK) consists
of using an excimer laser to ablate a thin amount of tissue from
the cornea's surface. Most focusing problems can be compensated
for by this slight adjustment to the shape of the cornea.
Myopia, astigmatism, and myopia with astigmatism can be treated
with PRK laser vision correction.   • Radial Keratotomy (RK) is
one of the oldest refractive surgery procedures. RK involves
making incisions in a radial pattern on the surface of the
cornea. These incisions cause the surface of the cornea to
flatten slightly, which can achieve the desired result –
correcting nearsightedness. Unfortunately, the results were
unpredictable and unstable. The more accurate laser vision
correction procedures available today are generally preferable
to RK.   • Astigmatic Keratotomy (AK) is somewhat similar to
radial keratotomy, the difference being that astigmatic
keratotomy is performed to treat astigmatism. Incisions are made
to flatten specific areas of the cornea. If