| Photorefractive keratectomy (PRK) is a laser eye surgery
procedure that is carried out with the key intent to correct a
patient’s vision. PRK permanently changes the shape of the
frontal corneal tissue using an excimer laser, which is a
high-precision ultraviolet chemical laser. The outer layer of
the cornea (epithelium) is removed, and then a small amount of
the corneal tissue is burnt off using the laser. Such an
ablation renders the desired shape to the cornea and allows for
optimal refraction. PRK is a technologically advanced surgical
procedure. For instance, a computer system tracks the eye
position around 4,000 times per second, redirecting laser pulses
for precise ablation. As mentioned above, the epithelium is
removed prior to ablation. This does not hamper the patient’s
vision, since the epithelium is a soft and regenerating layer,
which is capable of completely replacing itself within a matter
of days. However, the deeper layers, once burnt off, will remain
that way because they possess limited regenerative capability.
This theory is the cornerstone of the Photorefractive
keratectomy surgical procedure.
PRK differs from LASIK in a way that the epithelium is
removed in PRK and allowed to regenerate. On the other hand,
LASIK does not involve epithelium removal. Instead it consists
of cutting a flap in the cornea in order to make the desired
incisions. Compared to LASIK, a patient who has undergone PRK
experiences more pain and recovery is slow. However, both
procedures are similar in the respect that they make use of a
laser.
Photorefractive keratectomy is a viable procedure, but it
does have possible complications. Apart from slow recovery and
pain, the patient may experience glares and halos. As in any
refractive surgery, there is a possibility of over- or
under-correction. Eye surgeons typically perform PRK on one eye
at a time, in order to gauge the results of the procedure and
ensure its efficacy.
In a majority of cases, PRK has proven to be a safe and
efficacious procedure to correct myopia. However, since the
procedure is irreversible, it is recommended that the patient
consults an eye doctor instead of jumping on a conclusion.
You will find the
Directory of LASIK Surgeons useful. Nicola Kennedy publishes
articles and reports and provides news, views and information
about
alternatives to LASIK eye surgery at Your Lasik Information.
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Photorefractive
Keratectomy Laser Eye Surgery