Astigmatism. When the steepest curve runs vertically with the football lying on its side its called. Manifest astigmatism is the vectorial sum of anterior corneal toricity and internal astigmatism.
It may be helpful to think of the normal eye as being shaped like a basketball. Most people have between 05 to 075 diopters of astigmatism. Astigmatism usually is the result of irregularities in the radius of curvature of the cornea.
Most people have between 05 to 075 diopters of astigmatism.
Larger amounts can cause distorted vision eye discomfort and headaches. When light enters a perfectly spherical lens like a basketball it refracts or bends evenly. Eye strain you may notice this after concentrating for a long time on a computer for example Astigmatism normally happens alongside short-sightedness or long-sightedness. Most people have some degree of astigmatism.
