Astigmatism

Astigmatism is diagnosed with a routine eye examination. In an eye with a refractive error, the light rays do not bend properly to achieve a single focus point on the retina. Instead, light rays either focus in front of the retina, or do not focus

at a single point. A process called refraction is used to measure the refractive error of the eye. A visual acuity test is performed to determine the focusing power of the eye at different distances.