expression, noun
Common, everyday word for the eyeball. Often used in idiomatic expressions like 目の玉が飛び出る (to be astonished).
彼は目の玉をこすりながら起きてきた。
He got up rubbing his eyes.
その値段を聞いて、目の玉が飛び出るほど驚いた。
When I heard the price, I was so surprised my eyes nearly popped out.
Formal, medical term for 'eyeball'. 目の玉 is the everyday equivalent.
Compound of 目 (eye) + の (possessive particle) + 玉 (ball). Literally 'ball of the eye'.