Certified Dietary Manager (CDM) Practice Exam 2025 – All-in-One Guide to Exam Success!

Vitamin A is primarily associated with promoting good vision due to its critical role in maintaining the health of the retina and aiding in the function of the eyes. Specifically, a form of vitamin A called retinal is a crucial component of rhodopsin, a protein in the eyes that allows us to see in low-light conditions. Inadequate levels of vitamin A can lead to various vision problems, including night blindness and more severe conditions like xerophthalmia, which can damage the cornea and lead to blindness.

While other vitamins like B12, C, and D play essential roles in overall health, they do not directly influence vision in the same way that vitamin A does. Vitamin C is important for the health of blood vessels in the eyes, and vitamin D is associated with overall bone health and immune function, but neither has the specific role in vision that vitamin A possesses. Meanwhile, vitamin B12 is crucial for nerve function and the production of DNA and red blood cells, but it does not have a direct impact on visual processes. Thus, vitamin A stands out as the key vitamin for promoting good vision.