Yes, eye strain can make people in risks of astigmatism because astigmatism is an eye condition with blurred vision and there are two types of astigmatism, first is corneal astigmatism, it is caused by the problem on cornea, when it does not curve perfectly; The other one is lenticular astigmatism, which is caused by the problem in the lens, eye strain can easily cause some problems both on your cornea and in you lens.
Astigmatism is just like other two refractive errors. It is not an eye health problem but just an uneven curvature problem. Astigmatism is more likely to happen together with myopia and hyperopia. People with astigmatism would have a very blurry vision for multiple focus points. Actually eye strain is a very common sypmtom of astigmatism. With astigmatism, people's vision is blurred. In this situation, people would try harder to get a clearer vision which would cause eye strain soon. The common causes of astigmatism include the irregularly shaped cornea or lens.
People with astigmatism are usually born to be. Some people get this because of the bad habits of using of eyes. That is to say, the eye strain will also make people in the risk of astigmatism. 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 and nausea. You need to wear the eyeglasses to help you get the right vision. You could also do the warm compress to make your eyes feel comfortable.