How can one know if he has astigmatism?

[Hanley Hills]

What is the symptom of astigmatism?

[Hanlontown]

If you are have blurred vision accompanied with eyefatigue and eyestrain, you may suffer from undetected astigmatism. But these symptoms may not be the exact result of astigmatism, you'd better do an eye exam if you have these symptoms.

[Hannaford]

Put your glasses in front of your eyes horizontally, then turn the glasses to 90 degrees. Look the object through the glasses. If the object squeezes or expands, then you may have astigmatism.