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Astigmatism

Definition :
Astigmatism is a condition where vision is disordered (blurred, unfocused, fuzzy) because the cornea (the front surface of the eye) or lens, which is located behind the cornea, has an abnormal or irregular curve (misshaped). Astigmatism can occur in children as well as adults. Astigmatism is fairly common and not contagious.

There are two common types of astigmatism: corneal astigmatism and lenticular astigmatism.

  • Corneal astigmatism is when the cornea is misshaped.
  • Lenticular astigmatism is when the lens is misshaped.

There are several treatment options for astigmatism. If you suspect you have astigmatism, contact your doctor.

Causes :
The precise cause of astigmatism is unknown.

Risk Factors :
A risk factor is something that increases your chance of getting a disease or condition.

The following factors increase your chances of developing astigmatism. If you have any of these risk factors, tell your doctor:

  • Heredity: A family history of eye disease or disorders, such as glaucoma
  • Eye Surgery: Certain types of eye surgery, such as cataract (lens of the eyes are cloudy) removal
  • A history of corneal scarring or thinning
  • A history of excessive nearsightedness (a visual defect where distant objects appear blurred) or farsightedness (a visual defect where distant objects are seen better than objects that are close.)
Symptoms :
The symptoms for astigmatism vary from person to person. Some people might be asymptomatic (showing no signs of the condition) while others are symptomatic (showing signs of the condition). If you experience any of these symptoms do not assume it is due to astigmatism. These symptoms may be caused by other, less serious health conditions. If you experience any one of them, see your physician.
  • Dizziness
  • Headaches
  • Blurred (objects appear fuzzy) or distorted (objects appear twisted or out of focus) vision
  • Excessive squinting or closing of the eyes
Diagnosis :
Your doctor will ask about your symptoms and medical history, and perform a physical exam. You may also be referred to a doctor who specializes in the medical and surgical treatment of eye disorders and vision measurements (ophthalmologists) or a trained and licensed professional who can diagnosis vision and eye disease and prescribe corrective lenses (optometrist). Tests may include the following:
  • Visual Acuity Assessment Test (VAT)–This test is used to measure (assess) how well you can distinguish different size letters or symbols (very large to very small) at a specific distance.
  • Refractor Test–This test uses a refractor, a special instrument that has interchangeable lenses of different strengths, to measure how well you see objects at various distances. The ophthalmologist or optometrist will ask you to look through the lens and read a chart that is several feet away. The ophthalmologist or optometrist will adjust the strength of the lens based on the patient’s responses.
Treatment :
Talk with your doctor about the best treatment plan for you. Treatment options include the following :

Corrective Lenses

Corrective lenses, such as glasses or toric contact lens, are prescribed to offset the eye’s visual abnormalities or defects, such as excessive nearsightedness or farsightedness.

Surgery

To correct severe astigmatism, an ophthalmologist might use special knives or a laser beam to correct the abnormal or irregular curve of the cornea. The surgery is an outpatient procedure (does not require a hospital stay) that is performed with local anesthesia.

The are three types of surgical procedures that an ophthalmologist might perform:

Photorefractive Keratectomy (PRK)—Laser beams are used to reshape the abnormal or irregular curve of the cornea.

Laser in situ Keratomileusis (Lasik)—This is a type of PRK; the ophthalmologist uses a laser beam to reshape the curve of the cornea by making slices (laser cuts) to both sides of the cornea.

Radical Keratotomy (RK)—Small incisions (cuts) or holes are made into the cornea.

There are risk factors associated with all surgery. To choose the best surgical treatment option for your condition, it is important that you speak with your doctor about potential risks and side effects.

Prevention :
There are no known preventative measures that will reduce your chances of getting astigmatism. However, routinely getting a comprehensive vision exam will reduce your chances of astigmatism going undetected (unidentified) and untreated.
 
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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