I could not wait to give Cornelius eyes, as at the moment he looks like just a mesh. No Life, No nothing. So I got on it right away using the tutorial from the fabled book.
I created A nurb sphere and used the Hypershade editor to create a phong surface for the eye balls. I then used a 2D texture Ramp with a U Ramp setting to create the pupils and Iris.
I then created another Nurb Sphere, Slightly big
ger than the first and edited it's start and end sweeps to create Cornelius' Eye lids.
Heres the Outcome.