Which vitamin is critical for vision and is found in dark green vegetables?

Vitamin A is the correct answer because it plays a crucial role in maintaining healthy vision. This vitamin is essential for the formation of rhodopsin, a pigment found in the retina that is necessary for low-light and color vision. Dark green vegetables, such as spinach and kale, are rich sources of beta-carotene, which the body can convert into vitamin A.

In contrast, while vitamin C is important for overall eye health and helps prevent cataracts, it does not directly influence vision in the same way that vitamin A does. Vitamin D is primarily involved in calcium metabolism and bone health, and does not have a direct role in vision. The B vitamins are essential for energy metabolism and overall health, but they are not specifically linked to vision as vitamin A is. Thus, the significance of vitamin A in the context of vision, particularly its presence in dark green vegetables, highlights its vital role in maintaining eye health.