The most common sign of Astigmatism is distorted or blurry vision that doesn't get better or you may experience eye discomfort when on the computer or reading or you may also have a headache or eye strain as well.
Astigmatism is when you have a misaligned cornea or the cornea is not shaped correctly and sometimes surgery can be done on the eyes to correct the Astigmatism.
Astigmatism is not a disease but instead just a misshaped cornea and most commonly you'll have prescribed contact lenses or eyeglasses to wear to correct the Astigmatism naturally and be able to see better again.
An eye doctor will perform tests on your eyes to see how your vision is and will be able to tell if you have Astigmatism or not.