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Astigmatism is a very common condition wherein
the light rays entering the eye focus on two or more
separate points instead of at a point. This happens
when the front surface of the eye have some areas
that are steeper or flatter than other areas forming
asymmetrical curvature which cause the blurring of
vision.
The cornea and the lens are the two parts in the
eye that function to focus images. These images are
normal when these parts are in perfect curvature.
All incoming lights are bent in the same way
producing a clear image at the back of the eye
called retina. When either one or both have a
slightly different curvature in one direction, light
rays are not properly refracted. When the condition
is uncorrected it will cause the vision to blur.
This condition is generally hereditary, usually
present at birth. It may be seen together with
farsightedness or nearsightedness. The condition
remains constant, with blurring of vision at all
distances, until treated.
The principal symptom is inability to have a
clear image. There is a tendency to miss letters
while reading. There is also difficulty in seeing
fine detail at any distance.
This condition is treatable. The goal in
treatment is to correct the uneven curvature which
causes the blurring of vision. This can be done with
the use of corrective lenses in the form of
eyeglasses or contact lens. Refractive surgery can
also be done to reshape the surface of the eye.
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