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

Question

HELP...its confusing

Answer 1

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.

Answer 2

Optimum health will provide a feeling of well being. The chemistry of your blood effects your mind. As we age we produce more and more of a hormone called Mono Amine Oxydase (MAO) which causes depression. We don't notice it because it's a little bit more every day. That's why some elderly people become grumpy. A Doctor can prescribe an MAO inhibitor, or herbs like, St. John's Wort can help.

Answer 3

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.

Answer 4

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.

Answer 5

"vit A" = "retinol"

retinol + NAD(+) = retinal + NADH + H(+), catalyzed by retinol dehydrogenase.

now, retinal is all-trans

retinal is ligated to proteins (opsins)
when light is absorbed, it switches to 11-cis retinal, which causes a structural change to the protein component -> ion flux ->... ->perception of light.