Visible effect of Vitamin A deficiency is "night blindness". Person is not able to see in darker places. Later stages consists of irreversible damage to eyes. Vitamin A deficiency is very common nutrient deficiency, especially in preschoolers.
BUT, you don't necessarily need to go for Vitamin A supplement right away! Find it in your own kitchen...
Vitamin A is present in mainly 2 form: Beta Carotene and Retinol. They are found in these foods:
1. Green leafy veggies: spinach, amaranth, drumstick leaves.
2. Non-vegetarian sources: eggs, yolk, chicken liver
3. Fruits: apricot, guava, mango, papaya (ripe), watermelon
4. Carrots (of course!)
6. Garnishes, such as coriander leaves
7. Tubers, such as sweet potato and yams
8. Dates (also rich in iron)
10. Onion stalks and celery stalks