Title says it all.
In: Biology
They take different pathways through the brain. Pupillary dilation is a reflex that takes a more immediate pathway to the pupillary muscles. Think how you reflexively pull away from a hot stove before you even feel the heat.
Adaptation to the dark also requires the regeneration of photopigments in your retina to increase its sensitivity to light, which can take a few hours to fully adjust.
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