I am the transparent protective coat on the eye.

I control how much light enters the eye.

I am actually just a hole (i.e. nothing!).

I am the "coloured part" of the eye.

I am the part that is immediately behind the iris.

I contain most of the light-sensitive cells in the eye.

I contain the "receptor cells" for vision.

I am the photoreceptors that are best at detecting motion.

I am the photoreceptors that detect and respond to colour.

I carry nerve impulses to the brain.

In dim light, I work well.

I am the layer that prevents light rays bouncing off the inside of the eye.

I give the eyeball support for its shape.

I am not transparent.

I am the tough outer coating.