Duane and Face_Off's answer's seem good from the anatomical standpoint. So, a complex eyeball/socket model with multiple materials and a good renderer should be able to do it--unless it's really the soul, in which case, we'll have to wait for at least a 1.6225927682921336339157801028813e+32 bit CPU.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken