Controls the size of the pupil.
Controls the shape of the lens.
Finely focuses the image.
Protects the eye with transparent cells, and also roughly focuses the light.
Roughly focuses the light.
Jumbles up the light rays to be reassembled in the iris, and protects the eye with transparent cells.
Protects the eye with transparent cells.
Controls how far away you can see in focus.
Lets you see black (and white).
Controls the amount of light entering the eye.
Make black and white vision possible.
Make colour vision possible.
Make the image flip around.
The amount of light going into the eye
The lens shape
Here's an interesting quiz for you.