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![]() | About Astigmatism | |
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Astigmatism can also occur
when the cornea's shape is more oblong than spherical.
Normally cornea is spherical. The oblong shape causes light
rays to focus on two points at the back of your eye, rather
than on just one. Many people are born with this oblong
cornea, and the vision problem may get noticed over time. In
some people, astigmatism may be due to pressure of the eyelids
on the cornea. It can also be due to incorrect posture or an
increased usage of the eyes for close work. Heredity is also a
cause of astigmatism. Rarely it is caused by lid swellings in
a condition called chalazia or due to corneal scars. An eye
injury may cause the cornea to scar, changing the path of
light as it enters the eye. It may also be due to keratoconus,
a rare condition in which the cornea loses its normal shape.
Some patients experience surgically induced astigmatism after
eye surgery. Sutures that are tightly placed can cause a
slight wrinkling of the cornea and the patient will experience
astigmatism until the surgical wound is healed.
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