Astigmatism

What is astigmatism?

Although the name sounds awful, astigmatism is a simple condition whereby the cornea (the clear front of the eye) is oval in shape, rather than round (ie like a football rather than a soccer ball). This causes objects at any distance to appear unclear, as light will not focus to a point onto the retina. People with myopia or hyperopia can also have astigmatism.

Above is a demonstration of how astigmatism affects the focusing of the eye. A person with no astigmatism will see all of the lines of the above picture in focus. A person with astigmatism will see one or more lines in focus, whilst others appear blurry.

In our example above, the horizontal lines are perfectly clear, and become progressively blurry as they reach vertical. You can check for astigmatism now by covering one eye, standing three metres from the screen, and checking to see if any of the lines on the first picture appear more blurry. Or, try an online eyetest here!

An example of normal vision v astigmatism

What problems might a person with astigmatism experience?

Astigmatism, because of its irregular focusing, has a myriad of possible signs and symptoms. These include

• Difficulty seeing distant objects
• Difficulty seeing close objects
• Difficulty with computer screens
• Headaches
• Fatigue
• Ghosting (a faint overlapping second image)
• Lights tend to appear spread out
  

Who develops astigmatism?

Anyone can develop astigmatism at any age.

What causes astigmastism?

No-one is sure. There may be a weak hereditary component, although this link has not been confirmed.

Can astigmatism be cured?

No. Because astigmatism is a structural problem of the eye, there doesn't appear to be a much likelihood of a cure.

What should I do if I think I might have astigmatism?

You should arrange for an eye examination with your local Optometrist. Eye examinations in Australia are supported by the Medicare system for all Australian residents. Referrals are not required for an eye examination with an Optometrist. Your Optometrist will advise you if you have developed astigmatism, and will be able to recommend the best form of treatment if it is required.

What options do I have if I have astigmatism?