Presbyopia
Presbyopia is a condition in which the normal changes in the shape of the lens that occur when looking from a far away object to a near one (or vice-versa) are limited. Normally, the iris (the muscle around the lens) causes the lens to change shape as one looks at objects at varying distances. This phenomenon (called “accommodation”) allows the eye to focus at different lengths. When accommodation is impaired, the eye is unable to adjust sufficiently to nearby objects. As a result, people with presbyopia may be seen holding reading material at arm’s length in order to discern what is written.
The most common symptoms of presbyopia are blurred vision of near objects and difficulty doing close work. Many people find reading difficult and hold the material farther away in an attempt to see more clearly. A slowness in changing focus from near vision to distance vision may be noticed. Eye fatigue and headache after close work are also symptoms of presbyopia.
In addition, farsighted people will usually notice the symptoms of presbyopia sooner than those who are nearsighted, as nearsighted persons can simply remove their glasses to see close objects more clearly.
Blurred vision of near objects
Difficulty reading or doing close work
Eye fatigue or headache after doing close work
Difficulty changing focus from near to far vision
How is presbyopia treated?
Unfortunately, no treatment such as medication, diet or exercise will slow the progression of presbyopia. However, corrective lenses can be used to bring things back into focus. In many cases, new glasses are required about every two years to overcome blurred vision caused by an increased hardening of the lens.
 |
|
|
Contact Lenses
Links