A number of online tests can help people check if they have astigmatism. They usually display shapes and lines and ask the test taker to stand a certain length away from the monitor. You will alternate covering your left and right eyes during these tests.

Online tests can be a first step toward identifying a potential problem with your vision. If you get a positive result at home, you should follow up with a visit to your eye doctor. To get a precise diagnosis of astigmatism, however, you have to be evaluated by an eye specialist. The result from an online test relies on the person's judgment and may not be accurate.