The cornea is a special layer on the surface of the eye that bends light rays as they enter the eye. Light rays must be bent properly in order to create a sharper image. When parallel light rays pass through the cornea, they should be bent just enough to meet and focus on the retina. The lens is then responsible for adjusting the focus.
 
In farsightedness, the light rays meet at a point behind the retina. This causes close up objects to be blurred. This happens when the eye is too short back to front or when the cornea is too flat.
 
Hyperopia is partly genetic, children are more likely to develop hyperopia when either one or both of there parents has the condition. Many children are also born with a degree of hyperopia but are able to counteract it with the use of strong eye muscles. These muscles squeeze and stretch the lens behind the eye which forces the eye to focus correctly.
 
Find out more about diagnosing hyperopia.

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