|
|
Common Vision Problems
What are the
Different Procedures and Options?
THE ANATOMY OF YOUR EYE
COMMON VISION PROBLEMS
The eye works just like a camera. Light entering
the eye first passes through the cornea and is focused at the back of the eye to make a
clear image on the retina. Just as a camera cannot produce a clear photograph if the
incoming light is not focused precisely onto the film, the eye cannot produce clear vision
if the cornea does focus the light precisely onto the retina. The most common problem with
vision is the inability to precisely focus incoming light, resulting in blurred vision.
There are four types of focusing errors:
- Nearsightedness: People who are nearsighted see near
objects better than those farther away. With nearsightedness (also known as myopia), light
rays from distant objects are focused in front of the retina rather than on to it.
Nearsightedness occurs because the cornea is too steep or the eyeball is too long.
- Farsightedness: People who are farsighted see far
away objects better than those that are near. Farsightedness (also known as hyperopia)
occurs when the cornea is too flat or the eyeball is too short. Light rays from distant
objects are focused not onto the retina, but behind it.
- Astigmatism: People whose eyes focus light rays
unevenly have astigmatism. Astigmatism occurs when the cornea has an irregular shape. The
cornea should be round and symmetrical like a baseball. With astigmatism, it is shaped
more like a football. People with astigmatism see both near and far objects out of focus.
Astigmatism often occurs in association with nearsightedness or farsightedness.
- Presbyopia: This refers to the gradual loss of the
eye's ability to change focus. A normal part of the aging process, the onset of presbyopia
usually occurs after age 40. It is corrected by the use of reading glasses, bifocals,
contact lenses or monovision.
10 Reasons to choose SAN DIEGO EYE CENTER
Website created by Celestialink |
