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Astigmatism is a focusing error which causes blur. People with astigmatism generally observe it is worse at night and the edges of objects may not be sharp. The main cause of astigmatism is the shape of the front surface of the eye (cornea), though it can also result from a slight tilt of the lens within the eye. This can be an inherited characteristic or a normal variation accompanying growth.

The easiest way to describe the shape of the cornea with astigmatism is that of a football. It has two different curvatures. The result in light focusing through the cornea at two different locations, therefore the image does not focus to a point and is blurred.

How does Astigmatism affect me?
Objects at all distances are indistinct or blurred and the eye can not focus. Even slight degrees may encourage headaches, fatigue and reduce concentration. This is because the eyes may try, without success, to correct blur and because there is a tendency to screw up the eyes to see better, producing discomfort in the muscles of the eyelid and the face.

How is Astigmatism corrected?
Spectacles and contact lenses (hard and soft) can correct astigmatism. Sometimes correction of astigmatism can cause changes in the apparent size and shape of objects and may affect judgment of distance. A patient may feel taller or shorter, or walls may appear to slope and floors curve.