open someone's eyes
US /ˈoʊpən ˈsʌmˌwʌnz aɪz/
UK /ˈoʊpən ˈsʌmˌwʌnz aɪz/

1.
目を開かせる, 気づかせる
to make someone realize the truth about a situation, especially a difficult or unpleasant one, that they had not understood or known before
:
•
Traveling abroad really opened my eyes to different cultures.
海外旅行は本当に私に異なる文化を教えてくれた。
•
The documentary opened her eyes to the harsh realities of poverty.
そのドキュメンタリーは彼女に貧困の厳しい現実を教えてくれた。