Diagnosis of 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.
