Astigmatism is caused by an irregular shape of the cornea or a curvature of the lens, most people have a mild form of this but when it is great it can cause blurriness or soreness of the eyes.
To perform an Astigmatism test online simply look at the image below, if the lines seem different thicknesses or are distorted in any way then you have Astigmatism.
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To cure Astigmatism you can either undergo laser eye surgery or wear glasses
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