It's bad for you to suffer from astigmatism but it is unlikely for you to go blind. Astigmatism is caused by an irregularly shaped cornea or lens, when you get astigmatism, your vision may get worse and worse over time, but is is unlikely you will go blind. And by now, astigmatism has been correctable by corrective lenses or surgery.
So far, I never seen any proves that astigmatism can lead to blindness. But if you suffer astigmatism, it will become worsen as you age. People who with astigmatism may feel hard to focus on somethings. People often see blurry vision when suffer astigmatism. luckily, there are eyeglasses that can help you correct vision. Thought it can't cure it, but it can improve your vision when you wear it.
It is really bad for you to suffer from astigmatism which will make you cause blindness if you don't protect your eyes carefully. If the eyeball in refractive status is on the different meridian dioptre, especially on the surface of the cornea curvature radius which is not a sphere, the eyes in the absence of regulation will have 5 meters equal ray. The eye of different warp after inflectional cannot form a focus on the retina and form focal line. Thus the retina image blurred this refractive error state which is called astigmatism. If you use the eyes too much time in front of the computers which causes the damage on the eyes, you who are with astigmatism may have high possibility to get blindness. The astigmatism will cause you to have the blurred vision. Your far near vision is poor, seem to have double vision. You may have the easy eye fatigue, eye pain, headache, nausea and vomiting. You may have low astigmatism, with your far near vision generally normal. But when fine visual work gets easily in eye fatigue, your high astigmatism often appear blurred vision or the vision lost. You'd better wear the eyeglasses to help you get the right vision. You should protect the eyes from the healthy diet and good rest.