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VISION PROBLEMS
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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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