LASIK eye surgery can be an alternative to glasses or contact lenses done
for the correction of certain common vision problems.
LASIK (laser-assisted in situ keratomileusis) is a type of laser refractive
surgery — the best known and most commonly performed. In general, a
special type of cutting laser is used to precisely change the shape of your
cornea — the dome-shaped transparent tissue at the front of your eye
— to improve vision.
WHY IS IT DONE?
LASIK surgery may be an option for the correction of one of these vision
Nearsightedness (myopia). When your eyeball is slightly longer than
normal or when the cornea curves too sharply, light rays focus in front of
the retina and blur distant vision. You can see objects that are close
fairly clearly, but not those that are far away.
Farsightedness (hyperopia). When you have a shorter than average
eyeball or a cornea that is too flat, light focuses behind the retina
instead of on it. This makes near vision, and sometimes distant vision,
Astigmatism. When the cornea curves or flattens unevenly, the result is
astigmatism, which disrupts focus of near and distant vision.
LASIK is usually not advisable if you:
Have an eye disease called keratoconus, or if you have a family history of it
Have fairly good overall vision
Have severe nearsightedness
Have very large pupils or thin corneas
Have age-related eye changes that cause you to have less-clear vision (presbyopia)
Participate in contact sports that may be associated with blows to the face
LASIK often offers improved vision without the hassle of glasses or contact
lenses. In general, you have a very good chance of achieving 20/25 vision or
better after refractive surgery.
More than 8 out of 10 people who've undergone LASIK refractive surgery no
longer need to use their glasses or contact lenses for most of their activities.
Your results depend on your specific refractive error and other factors. People
with a low grade of nearsightedness tend to have the most success with
refractive surgery. People with a high degree of nearsightedness or
farsightedness along with astigmatism have less predictable results. In some
cases, the surgery might result in undercorrection. If this happens, you might
need another surgery to achieve the proper correction.
Rarely, some people's eyes slowly return to the level of vision they had before
surgery.This might happen due to certain conditions, such as abnormal wound
healing, hormonal imbalances or pregnancy. Sometimes this change in vision is
due to another eye problem, such as a cataract. Talk with your doctor about
any vision changes.