Why is Iris colored?

Related questions

1. How does the eye lens change when we look at a distant object?
2. What is the black portion of the eye called?
3. How does light travel through the retina?
4. Why is the human eye important?
5. How do eyes help us?
6. Does cornea protect eye?
7. Do bigger eyes see better?
8. What controls the amount of light entering the eye?
9. What are the 3 coats of the eye?
10. What is the difference between cornea and retina?

Tags

1. #passes
2. #colour
3. #amount
4. #degrees
5. #opaque
6. #retina
7. #everyone
8. #brown
9. #varying
10. #through
11. #light
12. #years
13. #function
14. #coated
15. #pigment
16. #melanin
17. #limit
18. #makes