Vitamins

Step 1: Night blindness (nyctalopia) is caused due to the deficiency of Vitamin A.

Step 2: Vitamin A is essential for the production of rhodopsin, a pigment necessary for low-light vision.

Step 3: Deficiency can be treated by increasing intake of vitamin A-rich foods like carrots, fish oil, and leafy greens.

Step 1: Vitamin A is essential for vision, immune function, and cell growth.

Step 2: Its deficiency primarily leads to night blindness (nyctalopia), which affects the ability to see in low light conditions. Other symptoms may include dry skin, weakened immunity, and delayed growth.