Astigmatism: A condition of refraction in which the image of the object is not a single point, but two focal lines at different distances from the optical system. the two focal lines are generally perpendicular to each other. In the eye it is a refractive error which is generally caused by one or several toroidal shapes of the refracting surfaces, or by the obliquity of the light entering the eye, but it can also develop as a result of subluxation of the lens or diabetes.
What is Astigmatism
Astigmatism is common minor eye condition that occurs in nearly everybody to some degree. It is caused by an irregular curvature of cornea and this causes vision to be blurred or distorted.
The shape of a typical eye is usually spherical so when light usually enters, it refracts evenly to create a clear view of the object. However, in an eye with astigmatism, the eye is shaped like a ruby ball, and so light is refracted more in one direction than the other allowing only part of the object to be in focus at one time making objects at certain distances appear blurred.
Astigmatism is usually present at birth and is often hereditary. It can also be the result of previous eye surgery.
Symptoms of Astigmatism
If left untreated, astigmatism can cause headaches, eye strain and fatigue
How astigmatism Is Treated
Most cases of astigmatism are actually so mild that no treatment is needed. However, in cases where vision is significantly affected, corrective lenses such as glasses or contact lenses can be used.
Laser treatment can be used to permanently correct astigmatism in adults
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