Laser
Refractive
Surgery
LASIK and
PRK with
the Excimer
Laser
The Excimer
Laser – used
for both
LASIK and
PRK is
computer
controlled,
precise,
accurate,
and fast.
The Excimer
is a cold
laser – it
does not
burn like
traditional
lasers
used in
surgery.
The Excimer
Laser uses
ultraviolet
light rays
to disrupt
chemical
bonds in
the target
(corneal)
tissue.
The lasered
corneal
tissue
falls away
in a controlled
fashion,
leaving
surrounding
corneal
tissue
undamaged.
LASIK
LASIK
(Laser
In-situ
Keratomileusis)
has been
the gold
standard
among procedures
for correcting
myopia,
astigmatism,
and hyperopia
for over
ten years.
Advances
in the
measurement
of refractive
errors
and in
laser delivery
- made
possible
with the
development
of Wavefront
Technology
- have
made LASIK
an even
more precise
and safe
procedure
than ever
before.
In the
LASIK procedure,
a flap
on the
corneal
surface
is created
using a
microkeratome
instrument,
and then
a computer
controlled
excimer
laser is
used to
reshape
the underlying
cornea.
The resultant
change
in corneal
shape results
in a refocusing
of light
onto the
retina
which reduces
or eliminates
the need
for glasses
or contact
lenses.
The surgery
is done
on an outpatient
basis in
minutes,
with most
patients
able to
return
to work
the same
week.
PRK
PRK was
the first
laser refractive
surgical
technique
to utilize
the excimer
laser.
In PRK,
unlike
LASIK,
no flap
is created.
Surface
corneal
epithelial
cells are
wiped away
and the
excimer
laser is
targeted
directly
onto the
underlying
corneal
tissue
to reshape
it. Many
patients
and refractive
surgeons
prefer
LASIK to
PRK because
visual
recovery
is generally
quicker
and discomfort
is minimized
with LASIK
relative
to PRK.
PRK nevertheless
has an
excellent
safety
and accuracy
profile – comparable
to LASIK’s.
PRK is
a good
alternative
to LASIK
for certain
patients
who might
not be
LASIK candidates
for reasons
related
to corneal
thickness
parameters
or with
certain
subtle
corneal
surface
irregularities.
The excimer
laser has
truly revolutionized
refractive
surgery,
and made
it a much
safer and
more accurate
set of
procedures
for a larger
number
of patients
wishing
to lessen
their dependence
on glasses
and contact
lenses.
Unfortunately,
laser refractive
surgery
is not
the best
option
for all
patients.
Certain
limitations
exist for
example,
with regard
to the
amount
of nearsightedness,
farsightedness,
and astigmatism
that can
be corrected.
Also a
variety
of underlying
eye and
systemic
disorders
need to
be ruled
out before
a patient
can be
deemed
a good
LASIK or
PRK candidate.
A good
way to
determine
if you
are a candidate
for LASIK
or PRK
is to schedule
a free
refractive
surgery
screening
with our
own fellowship
trained
refractive
surgeon,
Dr. Marc
Goldberg.