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Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids. Vitamin A has multiple functions: it is essential for vision, immune function, embryonic development and differentiation, bone metabolism, and haematopoiesis.
"Mentioned as being involved in the chemical reactions within the rods and cones of the eye, which convert light into electricity."