When you eat carrots, the beta-carotene is transformed into retinol or vitamin A. Carrots are high in Vitamin A, and a deficiency in this nutrient can cause some difficulty seeing in dim light. Vitamin A is essential for the formation of the chemical retinal, whose presence in the retina is necessary for vision. Our eyes have two kinds of light sensitive cells: the rods and the cones. The rods are the cells we rely on to see in dim light. They are sensitive to Vitamin A deficiency, because it can cause a shortage of retinal.