I don't have the capability of doing this myself, but....
If someone with a really good camera could fix it to focus on a snake's eye as it adjusted to light over a period of time, we could study how they do that.
I've noticed a lot of people say light affects the mood of their snakes, in addition to regular husbandry.
I know my BP prefers it kinda' dark. Perhaps it just varies from snake to snake on preference, but knowing how the eye works would be nifty.
Just thinking about the possibilities of how we could study our critters and create better environments for them.
Maybe someone has already done this or can explain the process with small words. LoL.