Cylindrical lens
= Cylindrical lens
{wiki=Cylindrical_lens}
A cylindrical lens is a type of lens that has a uniform curvature in one direction only, unlike a spherical lens which has curvature in two directions. This unique shape allows cylindrical lenses to focus light into a line rather than a point. Cylindrical lenses are used to correct astigmatism in eyeglasses, where light rays coming from different orientations focus at different points.