This article provides a simple guide to Lasik eye surgery.
Laser In-situ Keratomileusis or commonly known as LASIK is a
surgical procedure that is used treat a wide range of refractive errors in the
The eyeball, cornea or lens being shaped imperfectly causes
refractive errors of the eyes. The three common types of problem resulting from
refractive errors are as follows:
1. Myopia or nearsightedness. This condition is where only nearby or close
objects appear clear to the eye.
2. Hyperopia or farsightedness. This condition is the opposite of myopia and
it is where only objects far away or at a distance are clear to the eye.
Commonly elderly people require glasses to read a book.
3. Astigmatism, these are where images are blurred at a distance and near. A
combination of the above two conditions.
As indicated above, LASIK is a procedure-using laser that can change the
above condition that results in patients seeing clearly. In effective, LASIK
eliminates the reliance on glasses and contact lenses and thus increases the
individual's safety during outdoor activities or sport. In addition, the 24 hour
corrected vision and improved conveniences are achieved with as little as 1%
risk of side effects post surgery.
The LASIK procedure
Prior to the operation, anaesthetic is placed onto the surface of the eye to
numb and reduce irritation. The eye surgeon then starts with an instrument (Microkeratome)
to cut or peel a hinged thin flap of corneal tissue off the outer layer of the
cornea or eyeball. The flap is then lifted to the side where the laser treatment
can takes place.
The laser is then precisely pulsed to reshape the underlaying corneal tissue.
The LASIK procedure uses an excimer laser, which is a new class of UV laser
(approved by the FDA). It was originally developed for use in the microprocessor
industry and later found its application in vision correction. These lasers have
a much higher precision and accuracy that can change the shape of the cornea in
the eye. It does this by breaking the intra molecular bonds in the collagen
molecules during the laser pulse and thereby improving the way light is focused
or "refracted" by the eye.
One pulse of the laser can remove and reshape the internal cornea with an
accuracy of +/-0.25 microns. To understand the accuracy of one micron, a grain
of salt is about 60 microns and the eye can see particles to about 40 microns.
It would take about 200 pulses from an excimer laser just to cut a human hair in
half. Once the corneal is adjusted, the flap is laid back to the original
position prior to the cut and serves as a protective layer during the healing
process. The whole process takes only 15 minutes for each eye, which is why
LASIK has become popular.
After the procedure, the healing takes place quite rapidity as the cornea
bonds quickly. Healing can vary from three days to a week with a final clear
vision obtained. Your are now ready to view and see the whole world without
glasses or contact lens.
To find out the latest
news on LASIK, I
suggest you visit
some online LASIK sites.
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