The iris and the pupil.

[@vo2maximus177]

Retina next please Sam!

[@conniecasas4955]

Gracias Doc and happy Christmas 🎄

[@JamshaidWaqasLodhi]

پاکستان سے🎉❤

[@javierhillier4252]

Evolution's process is magnificent in what it can form over millions of years

[@zack_120]

Then the iris looks like just a decoration cover as both muscles controling the size of the peril are inside.

[@ausilianastasi2025]

Ma sarebbe possibile avere i sottotitoli in italiano , grazie

[@invisibleeagle6800]

Love the voice

[@vo2maximus177]

Why would the iris be coloured, and is that the same in animals? I guess sexual attraction in humans, who like to look into each other's soul via the eyes.

[@mis2788]

سبحان ﷲ

[@Rbg1333]

❤