A severe lack of which vitamin can lead to blindness?

A severe lack of vitamin A can lead to blindness due to its crucial role in maintaining healthy vision. Vitamin A is essential for the production of rhodopsin, a pigment found in the retina that is critical for low-light and color vision. Insufficient levels of this vitamin can lead to night blindness and, in extreme cases, can cause xerophthalmia, a condition that results in dryness of the conjunctiva and cornea, ultimately leading to blindness if left untreated. This highlights the importance of vitamin A in preventing vision-related diseases and maintaining overall eye health.