Topic Overview
What is nearsightedness?
Nearsightedness (myopia) is a
common cause of blurred vision. It can be mild, moderate, or severe. If you are nearsighted, objects in the distance
appear blurry and out of focus. You might squint or frown when trying to see
distant objects clearly. View a
photo as seen through a normal and a nearsighted eye.
Nearsightedness is usually a variation from normal, not a disease. Less often,
nearsightedness happens because of another disease or condition.
What causes nearsightedness?
Most nearsightedness
is caused by a natural change in the shape of the eyeball.
Less often, nearsightedness may be caused by a change in the
cornea or the lens.
These problems cause light rays entering the eye to focus
in front of the retina. Normally, light focuses directly on the
retina. See a picture of the
parts of the eye.
There is nothing you can do to prevent nearsightedness.
What are the symptoms?
The main symptom is blurred vision when looking at distant objects. You may have
trouble clearly seeing images or words on a blackboard, movie screen, or
television. This can lead to poor school, athletic, or work performance.
Your child may be nearsighted if he or she squints or
frowns, gets headaches often, or holds books or other
objects very close to his or her face. Children who are nearsighted may sit at
the front of the classroom or very close to the TV or movie screen. They may
not be interested in sports or other activities that require good distance
vision.
If you think that your child may be nearsighted, see an eye care
specialist. Treating nearsightedness
early may prevent children from having trouble in school and in social
settings.
When does nearsightedness start? How does it change over time?
Nearsightedness usually begins in childhood between ages 6 and 12. During the teen years, as the eyeballs continue
to grow, it may develop or get worse quickly. Teenagers may need
new glasses every 12 months or even more often.
Nearsightedness
usually stops getting worse by age 14 to 16 in women and by the mid-20s in
men. Most nearsightedness stabilizes at a mild to moderate
level.
How is nearsightedness diagnosed?
A routine eye
exam can show whether you are nearsighted. The eye exam includes questions
about your eyesight and a physical exam of your eyes. Ophthalmoscopy,
tonometry, a slit lamp exam, and other vision tests are also part of a routine
eye exam.
Eye exams should be done for new babies and at all
well-child visits.1 Nearsightedness is usually first discovered in children of grade-school
age.
How is it treated?
Most people who are nearsighted use eyeglasses or contact lenses to correct their vision.
Surgery can also reduce or fix nearsightedness. There are several surgery options, such as
LASIK, PRK (photorefractive keratectomy), and artificial lens implants. The goal of surgery
is to help you see more clearly without glasses or contacts. Most doctors consider
20/40 vision or better after surgery a satisfactory
result. People with 20/40 vision or better are allowed to drive a car without
corrective lenses.
If glasses or contact lenses are inconvenient for your work or lifestyle, surgery may be a good choice. But nearsightedness is not a disease, and a nearsighted eye
is otherwise normal and healthy. Weigh your desire to have clear
vision without glasses or contacts against the risks and cost of surgery. And be aware that you may still need to wear glasses or contact lenses
after surgery.
If you are nearsighted, get regular eye exams, and see your eye care specialist if you have changes in your vision.
