Eyeball model created in zbrush. Rendered, rigged and animated in 3Ds Max 2014. Everything you need is included.

A morph target is used to dilate the eye. The eye is also parented to look at controller.

There is .ztl file for you edit the model to your liking and resolution.

I used the skin plus shader for the SSS.
You just need to place the included shader in c:\Program Files\Autodesk\3ds Max ????\nvidia\shaders_autoload\mentalray\include\