eyes without brightness
眢 centers on eyes that lack light or vitality: dull, sunken, or lifeless eyes without brightness.
眢 combines 目 (eye) with 夗, which likely contributes a phonetic element. The exact historical development is uncertain, but the character is associated with dull or sunken eyes.
The eye 目 sits below a shape that looks like a person curled up in a dark corner. Imagine eyes that have lost their spark, becoming dull and lightless.
For ワン, picture a wan, pale face with lifeless eyes: wan -> ワン, and the eyes are without brightness.