ISSA Nutritionist Practice Exam

Which of the following vitamins is crucial for vision?

1. Vitamin B12

2. Vitamin A

3. Vitamin E

4. Vitamin K

The correct answer is: Vitamin A

Vitamin A is essential for vision because it plays a critical role in the formation of rhodopsin, a pigment found in the retina that allows the eyes to adapt to low-light conditions. This vitamin is involved in the maintenance of healthy vision and is necessary for the proper functioning of light-sensitive cells in the eyes, called rods and cones. Insufficient levels of Vitamin A can lead to vision problems and can even result in conditions like night blindness. In contrast, while other vitamins like B12, E, and K play various vital roles in overall health, they do not directly influence vision in the same way that Vitamin A does. Vitamin B12 is primarily involved in red blood cell formation and neurological function, Vitamin E acts as an antioxidant protecting cells from damage, and Vitamin K is essential for blood coagulation and bone health. Thus, among the vitamins listed, Vitamin A stands out as the crucial nutrient associated with vision.