Lasik Surgery - What Causes Nearsightedness?

Lasik Surgery - taking the mystery out ofand may need to wear bifocals to read.
nearsightednessFor those with moderate to high myopia who elect
Nearsightedness, known as myopia, can be causedto have Lasik surgery, they may find that Lasik
by one of two conditions. The cornea or crystallinesurgery corrects their distance vision but they may
lens is too powerful or the eyeball is too long andstill need bifocals for reading. Many patients find that
shaped more like an oval than a sphere. Both ofthis is a good trade off because it eliminates the
these conditions cause the image you are viewing toneed for wearing glasses or contacts when they
be projected in front of the retina instead of on thedrive, go sight seeing on vacation and participate in
retina, where it belongs for clear vision. Youngsports. They only need to wear glasses when they
children with myopia may need stronger and strongerread or do close up work. For most, this is a
glasses because the length of their eyeball continuescompromise they are happy to make.
to grow as they grow and the images becomeA well shaped cornea allows light to focus through
farther out of focus. Myopia for some adultsthe pupil evenly and the light rays display on the
stabilizes in their late 20s.retina in an even pattern. With a normal, but less
People with myopia cannot see objects clearly in theperfect cornea, the light focuses through the pupil
distance and their crystalline lens is not able to adjustunevenly at varying angles. To correct myopia, the
their focus automatically for them. They are able tosurgeon uses a laser to flatten the corneal curve of
see near objects clearly which is where the termthe eye to reduce its focusing strength. The laser
nearsighted came from. There are 3 categories ofthins the center of the cornea by vaporizing a small
myopia; low myopia, moderate myopia and highamount of tissue (less than the thickness of a human
myopia. As myopic persons age, those with lowhair). This change to the cornea, allows the image to
myopia may find it easier to read by removing theirbe projected on the retina where it belongs. With
glasses. But in contrast, those with moderate to highLasik surgery, your nearsightedness can be a 'thing of
myopia, find their near vision is limited as they agethe past'.