Astigmatism

Home » Glossary » Astigmatism

A lens with astigmatism has a different focal length for rays in a horizontal plane than for rays in a vertical plane. Suppose the object has the shape of a cross, then the horizontal line will be sharpened at a different distance than the vertical line.

Images © André Ruiter 2018 - 2022, unless otherwise stated.
Content may not be used without permission.