Question

Explain the term night blindness.

Answer 1

Night blindness:

1. Night blindness is a disease that is caused due to deficiency of vitamin A in food.
2. Some of the food sources of vitamin A are vegetables, fruits and dairy products.
3. Vitamins are necessary nutrients that are mostly found in green plants. For proper growth and good health, a normal body needs some vitamins per day as vitamins protect the body from various types of diseases.
4. Food contains various types of nutrients such as carbohydrates, proteins, fats, vitamins and minerals and if the food does not contain enough amount of vitamins, certain deficiency disease occurs such as scurvy, rickets and night blindness.
5. Vitamins are of two types- water-soluble( vitamin B and vitamin C) and fat-soluble vitamins( vitamin D, E, K, and A).
6. Symptoms of night blindness include poor vision in dim light and dryness of the cornea.