Astigmatism

Astigmatism is a condition in which one or more surfaces in the eye (usually the cornea or the intra-ocular-lens) refracts the light to two different focals, causing the light rays to produce the image in front and/or behind the retina and not directly on the retina. That is why near and distant objects can appear blurry.   
Correction with a cylinder lens focusing the light on the retina.

(For further information- watch the demo)

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