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How Vision Works

Vitamin A Deficiency

When severe vitamin A deficiency is present, then night blindness occurs.

Vitamin A is necessary to form retinal, which is part of the rhodopsin molecule. When the levels of light-sensitive molecules are low due to vitamin A deficiency, there may not be enough light at night to permit vision. During daylight, there is enough light stimulation to produce vision despite low levels of retinal.

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