Why would someone with a vitamin A deficiency might have dim vision at night?

HELP...its confusing
Answer:
The retina of the eye is composed of cones, which see colors and need a lot of light, and rods, which see black and white and need less light. Vitamin A is used to make the chemical that enables the rods in our eyes to see in lower light.

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Because the rods and cones in the eye are affected by low retinol(vitamin A) amounts and night blindness results. The condition is reversible by consuming adequate retinol.

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"vit A" = "retinol"retinol + NAD(+) = retinal + NADH + H(+), catalyzed by retinol dehydrogenase.now, retinal is all-transretinal is ligated to proteins (opsins)
when light is absorbed, it switches to 11-cis retinal, which causes a structural change to the protein component -%26gt; ion flux -%26gt;... -%26gt;perception of light.

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The substance or vitamin that helps you see in the dark better is called beta-carotene. Most foods that contain beta-carotene are orange and also contain Vitamin A.

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