What Causes Astigmatism?
Astigmatism is caused by uneven or irregular shape of your cornea, the front surface of your eye, or your lens, the part of the eye that focuses light onto your retina. If you have astigmatism, your vision may be blurred or distorted at all distances, near or far.
What Astigmatism Means
Astigmatism is not a disease; this is a very common misconception. It’s due simply to a variation in the shape of your cornea or lens, and it’s very common in people of all ages. If you are nearsighted or farsighted, there's a good chance you’ll also have a significant level of astigmatism. A small degree of this refractive condition is considered normal and does not require correction. But when astigmatism affects your ability to see clearly, glasses, contacts lenses, or LASIK surgery are common ways to solve the problem. Or, if you need cataract surgery, talk to your surgeon about astigmatism-correcting intraocular lenses (IOLs), which can treat both cataracts and astigmatism at the time of surgery.