The term presbyopia means "old eye" and is a vision condition in which there is a loss of the ability to see close objects or small print clearly. It is a normal process that happens slowly over a lifetime. Presbyopia can happen to anyone, even to those people who have never had any vision problems before. The major cause of presbyopia is the loss of elasticity of the lens of the eye. As people grow older the lens of the eye becomes less flexible and elastic, and the muscles become less powerful. Due to these changes the lens of the eye fails to adjust them properly as a result of which close objects appear to be blurry.
It can be seen even among people who are nearsighted, as their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance vision.
The symptoms of presbyopia are usually noticeable by age 40-45, when people experience blurred near vision while reading, sewing or working at the computer.
.
In presbyopia, people hold books, magazines, newspapers and other reading materials at arm's length in order to focus properly. When they perform near work, such as embroidery or handwriting, they may develop headaches, eye strain or feel fatigued.
Presbyopia, can be corrected by using eyeglasses with bifocal or progressive addition lenses (PALs). It is often corrected with reading glasses. Bifocal glasses can be used to see objects clearly, both near and distant
Presbyopes also can opt for multifocal contact lenses, available in gas permeable or soft lens materials. Another type of contact lens correction for presbyopia is monovision, in which one eye wears a distance prescription, and the other wears a prescription for near vision.
No comments:
Post a Comment