Deficiency Causes Vision Problems and Color Blindness

The deficiency of Vitamin A is directly linked to issues with vision, including night blindness and potentially color blindness.

Role of Vitamin A in Vision

• Vitamin A is essential for producing rhodopsin, a protein in the eyes that allows vision in low light conditions.
• A lack of Vitamin A can lead to night blindness (nyctalopia), an early symptom of Vitamin A deficiency.
• Severe or prolonged deficiency can cause xerophthalmia, a condition characterized by dry eyes and progressive vision loss, which can impact color perception.

Why Other Options Are Incorrect

• Vitamin C deficiency causes scurvy, affecting connective tissues, not primarily vision or color blindness.
• Calcium is crucial for bones and teeth; its deficiency (hypocalcemia) causes issues like muscle cramps and osteoporosis, not direct vision impairment like color blindness.
• Vitamin K deficiency affects blood clotting; it does not cause color blindness or poor vision.

Therefore, Vitamin A deficiency is the cause of color blindness and poor vision among the given options.