Lack of which vitamin is known to cause night blindness?

Night blindness, or difficulty seeing in low light or darkness, is primarily associated with a deficiency of vitamin A. This vitamin plays a crucial role in the formation of rhodopsin, a pigment in the retina that is essential for vision in dim light. When there is an insufficient amount of vitamin A in the body, the regeneration of rhodopsin is impaired, leading to difficulties in adjusting to changes in light levels and subsequently causing night blindness.

While other vitamins serve vital functions within the body, they do not specifically relate to night vision in the same manner as vitamin A. Vitamin C is primarily known for its role as an antioxidant and in collagen synthesis; vitamin B12 is essential for red blood cell formation and neurological function, and vitamin D is crucial for calcium absorption and bone health. Therefore, the link between vitamin A and night blindness is well-established, reinforcing why it is the correct choice in addressing the question asked.