Note that the pupil size is NOT changing. The shape of the cornea and resulting distortion from refraction is making it seem larger/smaller. The number underneath them is the setting of my 'Optics' dial. The default, 0 is totally parallel. I have no clue which is 'correct' and don't really have the time to test it at different angles/scenarios.

Here's an animated .gif hosted offsite since for some reason .gifs posted on Rosity don't animate... Cornea Shape

In an ideal world the cornea should be bulging outwards from the eye, but in 3D this is a problem since then the eye is nonspherical and clips through the eyelid in any eye pose other than 'wide-eyed looking directly at the camera'. I don't see eyelid:cornea collision detection becoming a thing anytime soon so this is the best compromise I think.