Problem with Lens and Iris in Eyeball model

blend and nec. map are here:

picture of problem here:

I have tinkered with lens refraction, but when the cam is at the side, looks like the iris is bending to look at the cam. when I look at the side of my wife’s actual eyeball, the iris is much more perpendicular to the direction her eye is pointing.

any suggestions how to fix this eye?

thank you!