Astigmatism

What Is Astigmatism?

Astigmatism is a vision condition in which light entering the eye is unable to be brought to a single focus, resulting in vision being blurred at all distances. Astigmatism is not a disease, but a vision condition that is quite common. It often occurs in conjunction with other refractive errors like nearsightedness and farsightedness.

Why Does Astigmatism Occur?

Typically, astigmatism is caused by the front of your eye (the cornea) being more oval than round, and not allowing light to focus properly on the back of your eye (retina). The causes of this irregular shape vary. In some cases, it may be hereditary or it may result from such factors as pressure of the eyelids on the cornea, incorrect posture, or an increased use of the eyes for close work.

How Common Is Astigmatism?

Most people have some degree of astigmatism. However, only individuals with moderate to highly astigmatic eyes usually need corrective lenses. What are the signs/symptoms of astigmatism? People with significant amounts of astigmatism will usually have blurred or distorted vision. Those with mild astigmatism may experience headaches, eye strain, fatigue, or blurred vision at only certain distances.

How Is Astigmatism Diagnosed?

A comprehensive eye examination by your doctor of optometry will include testing for astigmatism.

How Is Astigmatism Treated?

Astigmatism can generally be optically corrected with properly prescribed and fitted eyeglasses or contact lenses. In recent years various ophthalmic laser surgical procedures, including LASIK, have been developed to alter the shape of the cornea to correct low or moderate astigmatism. There is also a procedure called Corneal Refractive Therapy (CRT), or orthokeratology, which uses a series of rigid contact lenses to provide improved vision for extended periods of time. Your doctor of optometry can help you decide if these procedures are right for you.

Does Astigmatism Get Progressively Worse?

Astigmatism may change slowly. Regular optometric care can, however, help to ensure that proper vision is maintained.

How Will Astigmatism Affect My Lifestyle?

You may have to adjust to wearing eyeglasses or contact lenses if you do not wear them now. Other than that, astigmatism probably will not significantly affect your lifestyle at all.

This information provided by the American Optometric Association (AOA). To find out more, visit their website at www.aoa.org.