PRK (Photorefractive
Keratectomy)
PRK
(Photorefractive
Keratectomy) is
a type of laser eye surgery which is similar to Lasik.
However, PRK requires less instrumentation and avoids the
creation of the flap. Comparing to Lasik, it is more
discomfort and requires longer recovery period. PRK was
invented in 1980s and was performed in Canada prior to its first FDA
approval in 1995.
PRK procedure
is performed using excimer laser, a cool light ultraviolet
beam to remove tissues from the surface of the cornea. After
the cornea is reshaped in a proper way, it will be
able to focus the light into the eye and onto the retina. As a result, the
defective eyesight will have then a clearer and better
vision. For the correction of myopia, the
too-steep cornea is flattened; for the case of hyperopia, a
steeper cornea is created.
Who is the
best candidate for PRK?
Patients whose cornea may be too thin to make the corneal
flap and whose pupil may be too large for Lasik are best to
undergo PRK procedure. This procedure can be used for
nearsightedness, farsightedness as well as astigmatism.
Before the
surgery, it is
important to have a thorough check-up first with the medical
center or the doctor’s clinic who will operate the eye
surgery. During the check-up,
they will look into your medical history and perform an eye
examination. The examination will identify the thickness of
the cornea, refraction and pupil dilation. After the result
of the test and medical history is evaluated, the doctor
will advise you the best option to correct your eye problem.
If you are contact lens users, the doctor might advise you
to stop using the lenses for at least a minimum of three
weeks prior to the surgery.
During
the surgery,
eye drops is used to anesthetize the eyes. You won't feel
pain during the whole procedure which only takes a few
minutes. You are awake all the time. You will be advised not
to use any hair accessories and make-up on the day of
surgery. This will ensure the absence of any physical
hurdles during the laser operation.
After the surgery,
patients can go home
after a bit rest at the clinic. Most patients can return to
the majority of their normal daily routines in one to three
days. It is important to have good rest and immediately call
your doctor if there is any problem. You should also avoid
rubbing your eye and doing strenuous exercise for at least a
week. The recovery stage is very important as it will affect
your vision if anything goes wrong.
