Hello
I'm trying to create a different style character with large eyes (as per the image provided). You can clearly see that the eye is relatively flat but when animated, the pupil moves without distortion. I would like to ask if somebody knows the best method to create this style of eye? I'm thinking it involves a lattice to maintain the flatness but my tests have demonstrated that there is squashing of the pupil when the pupil looks too far downwards or upwards due to the lattice.

Any help will be appreciated.

Thank you.