pupil (of eye)
瞳 centers on the pupil of the eye, the dark central opening that lets light in.
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
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.