Astigmatism is a condition in which vision at all distances may be blurred or distorted.This occurs when there is irregularity in the shape of the front surface (cornea) of the eye. Astigmatism is not a disease, but is actually a vision condition that is quite common.

When the front of the eye is more oval then round, light does not focus properly on the back of eye (the retina). The causes of astigmatism are unclear. In some cases, it may be genetically inherited or it may result from various environmental factors such as poor lighting, incorrect posture, or an increased use of the eyes for close work.

People with severe astigmatism will usually have blurred or distorted vision. People with mild astigmatism may experience headaches, eye strain, fatigue and blurred vision at certain angles.