Are
you considering LASIK surgery? Freedom from eyeglasses
and contact lenses. Freedom from low light and night
vision problems. Laser vision surgery could be your
best answer to visual freedom.
There
are a variety of remedies to vision problems, ranging
from the traditional solution of glasses and contact
lenses up to and including vision correction procedures
like LASIK procedure. It's very important to talk with
your eye doctor about which vision correction procedure
is right for you.
While
LASIK is the most popular laser eye correction procedure,
there are many other types that may be right for you.
Your doctor will be able to select the best vision correction
procedure for your eye problems and lifestyle. He or
she may suggest:
-
LASIK vision correction: The most widely performed
laser vision correction procedure, LASIK is virtually
painless and quick-healing.
- Customized
LASIK or Wavefront LASIK: A new type of LASIK
that creates a customized procedure to correct your
vision. It addresses problems that eyeglasses, contact
lenses, and conventional LASIK can't address.
- PRK:
A type of laser vision correction used for some patients
with specific needs. Your surgeon may recommend it
depending on your diagnosis.
- LASEK:
LASEK is similar to the PRK procedure, with some potential
advantages.
IntraLasik
Lasik
surgery involves two basic steps: creating a corneal
flap and reshaping the cornea according to prescription.
Traditionally, the corneal flap during LASIK has been
created with a microkeratome blade. It is well documented
that a large part of the risks and complications from
LASIK arise during the creation of the flap. Surgical
techniques have been modified and instruments have been
refined to improve the results and decrease complications,
but nothing has made as significant an impact on improving
LASIK as the IntraLase femtosecond laser.
This instrument utilizes an infrared laser and IntraLASIK
software to create a corneal flap at a pre-programmed
depth and position. As a low-pressure soft suction ring
holds the eye, the laser cleaves the corneal tissue
at the predetermined depth forming bubbles of water
and carbon dioxide at that plane. These bubbles connect
to create a smooth surface that will become the interface
between the flap and the corneal bed. The laser energy
neither alters corneal curvature nor affects the prescription.
There is no damage or change to the surrounding tissue.
The 3-micron laser spot size gives a very smooth ablation
with pinpoint accuracy. The IntraLase pattern zigzags
the laser energy starting at the hinge and then continuing
back and forth across the cornea. Finally, the laser
cuts the edge of the flap circumferentially, leaving
the hinge area untouched. The whole process takes approximately
one minute per eye.
The obvious advantages of a flap created with IntraLase
over a microkeratome are that there is little to no
possibility of corneal abrasion, thin flap, thick flap,
partial flap, incorrect diameter, or buttonhole flap.
No one has ever gone blind or needed a corneal transplant
with IntraLase. Furthermore, because the flap is uniform
thickness from center to edge (like a manhole cover),
there is less chance of flap slippage or wrinkling if
accidentally rubbed or bumped during healing after surgery.
Also, because the resulting flap is uniform thickness
across the diameter, the IntraLASIK is ideal for far-sightedness,
high amounts of nearsightedness, large pupils, moderate
to high astigmatism, and small corneal diameters where
producing a large enough flap for treatment far into
the periphery is critical. Yet another advantage is
the ability to create a very thin flap so as to maintain
optimal corneal thickness when treating higher prescriptions
or thinner corneas.
Because IntraLase programs the laser to produce flaps
with vertical edges (again, like a manhole cover), it
is more difficult for the outer layer of cells to migrate
down under the flap into the interface since the length
of the route for those cells is increased.
There are minor disadvantages of the IntraLASIK approach
compared to the traditional microkeratome. Because the
suction ring is on the eye for up to a minute, although
at a relatively low pressure, there may be a greater
chance of temporary eye redness on 5 percent of patients.
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