Wishing that light sources can trigger automatic gentle squint morph/eye strain and pupil dilation. I think that might be the last issue to get realism for eyes. I hope either Reallusion makes this or someone else that can make a plugin. There should likely be a bit of a delay of the trigger. Maybe this is connected to Reallusion's SSS because it's almost as if the shader knows to light a subject if the light is coming from behind. In this case if the light is behind the pupil and squint morphs rewind but if the light is in front the morphs levels are increased.

Ultimately if a flashlight is in your character's face, you know what ideally should happen and it would save time with automation with light levels than trying to sync it up manually for every slight change.