What is the opening of the eye called?

Related questions

1. How do the eyes help us to see?
2. How far can the human eye see clearly?
3. How do the eye and brain work together to process what we see?
4. How do eyes help us?
5. How can I treat blurred vision naturally?
6. What is the correct pathway of light through the eye?
7. In what order does light pass through the eye?
8. Which parts of the eye are most important when it comes to focusing light?
9. Why is the human eye important?
10. What are the 3 tunics of the eye?

Tags

1. #inner
2. #thirds
3. #called
4. #front
5. #lines
6. #choroid
7. #retina
8. #opening
9. #colored
10. #which
11. #circular
12. #center
13. #eyeball
14. #pupil
15. #layer