Causes
The cornea has uneven curves or irregular curvature, thereby resulting in multiple focal points on the retina.

Symptoms
If you have only a small amount of astigmatism, you may not notice it or have just slightly blurred vision. Sometimes uncorrected astigmatism can give you headaches and distortion or blurring of images at all distances. Many people have astigmatism in addition to nearsightedness or farsightedness.

Treatment
If the degree of astigmatism is slight and no other problems of refraction- nearsightedness or farsightedness- are present, corrective lenses may not be needed. If the degree of astigmatism is great enough to cause headache or distortion of vision, prescription lenses will be needed for clear and comfortable vision. You also may choose refractive surgery for correcting astigmatism.
 
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