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Thursday, January 22, 2009

Farsightedness

Farsightedness (hypermetropia) - the inability to see close objects - is connected to the shortened form of the eyball or insufficient power of cornea. With farsightedness light rays passing through the cornea focus behind the retina, as a result of which the image perceived as blurred. People suffering from the hypermetropia of high degree can hardly see close as well as distant objects. With young people slight hypermetropia can be compensated at the expense of the active work of the lens. At that the person sees distant as well as close objects equally clearly but the overstrain causes headache, the feeling of "sand" in the eyes and quick tiredness.


With elderly people the inability to see close objects clearly can be caused not by the shortened form of the eye but the reduction of the lens elasticity and its muscles weakening. This disease is called presbyopia or gerontal farsightedness.


Todat there exist three methods of correcting farsightedness:

spectacles
contact lenses
laser correction.


Historians divide the authorship to the invention of spectacles between the emperor Neron who gazed at the gladiators' fights through a large emerald and ancient Chinese who used to tie especially finished pieces of quartz glass to the eyes. Ancient Roman doctors tried to treat shortsightedness by prescribing the patients to lay bags with sand onto the eyes, which caused temporary change in the cornea form and the whole eyeball and, in a way, anticipated modern surgical correction methods.

1 comment:

Unknown said...

Hyperopia (farsightedness) is an eye condition in which close objects are out of focus and far away objects are clear. Hyperopia can occur if your eyeball is too short, if the cornea has too little of a curve, or the focusing power of your eye is too weak. As aging occurs, contact lenses or glasses may be used to correct the problem. Hyperopia usually runs in the family and can affect both males and females equally.You can consult expert Dr. Tracy, he will test for farsightedness (Hyperopia) by performing various vision tests. In mild cases of farsightedness, your eyes may be able to compensate without corrective lenses. For moderate to advanced cases, treatment options for hyperopia usually include contact lenses, glasses, or Lasik For Farsightedness.