“Suppose the first American astronauts to walk on the moon had brought back, along with moon rocks, an oblong black box that appeared from the outside to have been crafted by machines. Suppose further that, when opened, the box contained the workings of a camera: it had parts that functioned like the lens, shutter, and other components of a camera. Obviously, such an object would excite enormous and justifiable curiosity about how it came to be. It is hard to imagine any skeptic’s gaining respect by maintaining that the principle of sufficient reason did not apply to such an object. Equally absurd would be efforts to explain the box in terms of chance, natural forces. The very nature of the object pointed to its having been made by an intelligent being. The human mind properly balks at the suggestion that a cameralike object was produced by chance, natural forces. But then how much more should we reject claims that something far more intricate, such as the human eye, resulted from anything less than an intelligent being.” Ronald Nash, Faith and Reason (Grand Rapids: Zondervan, 1994, p. 135.)

This diagram details the different parts and structures of the human eye showing:
1. conjunctiva
2. ora serrata
3. cilliary body
4. aqueous
5. iris
6. ant. chamber
7. cornea
8. pupil
9. lens
10. post. chamber
11. canal of schlemm
12. central retinal vein
13. optic nerve
14. central retinal artery
15. macula
16. retina
17. choroid
18. sclera
19. vitreous