pupil (of eye)
瞳 centers on the pupil of the eye, the dark central opening that lets light in.
瞳 combines 目 (eye) with 童, which likely contributes the sound and may relate to the idea of a child or pupil, as the pupil reflects a small image of oneself.
The left side is 目 (eye), and the right side 童 suggests a child. Imagine looking into someone's eye and seeing a tiny child-like reflection in the pupil.
For ドウ, picture a doughnut-shaped pupil: dough -> ドウ, and the dark center of the eye looks like a tiny doughnut.
pupil (of the eye)
pupil (of the eye)
pupil (of the eye)
here's looking at you, kid; cheers to your eyes
mydriasis
mydriatic agent; mydriatic drug
leukocoria; leukokoria; amaurotic cat's eye
to strain one's eyes; to stare
pupillary reflex
sphincter muscle of the pupil; sphincter pupillae
pupil dilation; mydriasis
pupil constriction; miosis
miosis; myosis