Hyperopia, also called farsightedness, is a condition in which a person
has difficulty seeing objects that are located close to the eye, although
vision of distant objects (that is, far vision) is good. |
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Farsightedness: Visual image
is focused behind the retina. |
Normal vision occurs when light is
focused directly on the retina rather
than in front or behind it. |
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In most cases, farsightedness is an inherited condition that is caused by an abnormally
short eye, as measured from front to back. This situation reduces the distance between the
cornea (the clear film that covers the front of the eye) and the retina (the light-sensitive
layer at the back of the eye). As a result, images tend to focus behind the retina,
rather than on the retina itself. Sometimes, the eye is able to partially or totally
compensate for this focusing problem through a process called accommodation.
In accommodation, tiny ciliary muscles within the eye contract, altering
the shape of the lens and bringing the viewed object into focus. |
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