It was previously believed that our pupil size was only affected by three things: light, focusing on nearby objects and cognitive effects.

Pupillary light reflex can be inhibited by multisensory signals Aug 11, 2021 Pupil size during very light exercise predicts benefits to prefrontal function, study shows ...

Here, the authors show that regenerated axons in an optic tract injury model form functional synapses, restoring the pupillary light reflex, and highlight neuronal types and presynaptic activity ...