Astigmatism is characterized by an irregular curvature of the cornea. This is one type of refractive error. Astigmatism occurs in nearly everybody to some degree. For significant curvature, treatment is required. Astigmatism is a common eye condition that’s easily corrected by eyeglasses, contact lenses, or surgery.
A person’s eye is naturally spherical in shape. Under normal circumstances, when light enters the eye, it refracts evenly, creating a clear view of the object. However, the eye of a person with astigmatism is shaped more like a football or the back of a spoon. For this person, when light enters the eye it is refracted more in one direction than the other, allowing only part of the object to be in focus at one time. Objects at any distance can appear blurry and wavy.
Astigmatism parted as two types:
1. Corneal astigmatism – the cornea has an irregular shape
2. Lenticular astigmatism – the lens has an irregular shape
Other eyes disease: