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Some of the Most Common Eye
Conditions
NEARSIGHTEDNESS
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FARSIGHTEDNESS ~
ASTIGMATISM
~ PRESBYOPIA |
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Myopia or "nearsightedness"
is that dioptric condition of the eye in which parallel rays of light
from infinity come to a focus in front of the retina. When you are
myopic, you are able to see clearly up close, but everything in the
distance is blurred. Myopia is the result of an eyeball that is too
long, or a cornea that is too steeply curved.
Symptoms of Myopia
The inability to see distant objects clearly or the need to hold a
book too close to the eye while reading are the usual complaints of
myopic patients. Eyestrain and headache may also occur due to myopia.
Sometimes the patient sees black spots floating before the eyes and
occasionally flashes of light are also noticed.
What a myopic person sees
Treatment
The treatment of myopia comprises prescribing appropriate concave
lenses and paying attention to ocular hygiene. The myopic patient is
fitted with eyeglasses or contact lenses that compensate for
the elongated shape of the eyeball, thus allowing the light to focus
properly on the retina.
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Hyperopia or "farsightedness"
is an error of refraction wherein parallel rays of light come to a
focus behind the retina. When you are hyperopic, you will have no
problem seeing objects in the distance, but there will be difficulty
in focusing clearly on near objects. Hyperopia occurs when the eyeball
is too small or the cornea is too flat.
Symptoms of Hyperopia
Common symptoms of farsightedness include difficulty in concentrating
and maintaining a clear focus on near objects, blurred vision,
eyestrain, fatigue and/or headaches after close work, aching or
burning eyes, poor reading ability, general tension and irritability
or nervousness after sustained concentration.
What a Hyperopic person sees
Treatment
Hyperopia is corrected by prescribing appropriate convex lenses.
Eyeglasses or contact lenses.
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Astigmatic Eye
Astigmatism is that
condition wherein the refraction varies in different meridians of the
eye. It occurs when light entering the eye is "split" into two
separate parts instead of focusing on one precise point on the retina.
Astigmatism is commonly caused by abnormalities in the curvature of
the cornea. If you are astigmatic, you will experience a distortion or
blurring of images at all distances, nearby as well as distant.
Symptoms of Astigmatism
Astigmatism may cause
blurred vision, eyestrain or even headaches. It can also cause images
to appear doubled, particularly at night.
What an astigmatic person sees
Treatment
Astigmatism can be corrected with appropriate eyeglasses or
"Toric" lenses.
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PRESBYOPIA
Presbyopia is progressive
farsightedness that develops as we grow older. It is a condition that
occurs as the eye's lens grows older and begins to lose some of the
elasticity needed to switch focus between viewing near and far
objects. The age at which presbyopia is first noticed varies, but it
usually begins to interfere with near vision in the early forty's.
What a
presbyopic person sees
S ymptoms
of Presbyopia:
- Need to hold reading material further and further away to be
able to focus.
- Vision is blurred at the normal reading distance; especially in
poor light.
- Headaches and/or eye fatigue after or during concentrated close
work.
Treatment
Presbyopia is treated by wearing
the prescribed eyeglasses or contact lenses that allow the eye to
refract light rays effectively. |
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