| Vitamin A Deficiency |
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| u | Vitamin A
deficiency causes night |
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| blindness and
is the single most |
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| important cause
of childhood |
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| blindness in
developing countries. |
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| Every year,
about 500,000 children |
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| lose their
sight as a result of vitamin |
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| A deficiency.
The majority (about |
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| 70%) die within
one year of losing |
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| their sight. |
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