How people get astigmatism and why?

i wonder how people see the world with astigmatism. i want a reason like is the computer that provoke astigmatism or what proke it.

http://www.mayoclinic.com/health/astigma...
Fuzzy vision. Not caused by computer. It's a defect of the eye. The way it is shaped.

It is just the shape of the front surface of your eye (the cornea).
It means that is is shaped more like a football than a basketball. This will cause objects to appear elongated when not corrected. The shape of your cornea is like the size of your foot, hard to change, so love it or not they are your eyes

The computer has nothign to do with it. Astigmatism is caused by an irregular shape of the eye. This means you just see everything a little bit fuzzy (or a lot, depending on how bad the asitgmatism is ).

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