Turn the sound up and watch her pupils.
That is a great video!
BTW, pupils are students in school. Pupillae is the plural form of pupil of the eye. Just sayin'.....
Somebody better tell my eye doctor! He always says he's going to dilate my pupils.
It's easier to understand, but still technically incorrect. The old fashioned definition has been abandoned for decades. Tell him I said so and see what he says.
Pupil - Wikipedia
If the drug pilocarpine is administered, the pupils will constrict and accommodation is increased due to the parasympathetic action on the circular muscle fibers, conversely, atropine will cause paralysis of accommodation (cycloplegia) and dilation of the pupil.