Astigmatism is a
refractive error of the eye, which causes blurred or distorted vision.
It is one of the most
common vision problems.
The exact cause of
astigmatism is unknown. It is usually
present from birth.
usually occurs when the front surface of
the eye, the cornea, has an irregular curvature
irregular shape prevents light from focusing properly on the back of the eye,
the retina. As a result, a person's vision
may be blurred at all distances
. Undetected astigmatism is usually
associated with fatigue and eyestrain
It can occur with or without shortsightedness or long-sightedness.
can diagnose astigmatism with a thorough eye exam. Almost all degrees of
astigmatism can be corrected with eyeglasses
or contact lenses.
Another method for correcting astigmatism is refractive or laser eye surgery
by changing the shape of the cornea.