Simple Test for Astigmatism

The lines of this fan diagram were drawn to be the same width and darkness. If some appear to be distinctly darker and more sharply focused, it is likely that your eyes have some astigmatism.

A common form of astigmatism results in different focal lengths for different incident light planes. When a person with astigmatism looks at the pattern, the eye will focus most sharply for one plane and the lines near that plane will appear darker and more distinct.