eye–open·er 
/ˈaɪˌoʊpənɚ/ noun
plural eye–open·ers /ˈaɪˌoʊpənɚ/ noun [count] informal : something that shows or teaches you something in a surprising way
▪ Traveling abroad can be a real eye-opener to many people. ▪ They say her biography is quite an eye-opener. ▪ The speech was an eye-opener for us. — see also open your eyes at 2open
▪ Traveling abroad can be a real eye-opener to many people. ▪ They say her biography is quite an eye-opener. ▪ The speech was an eye-opener for us. — see also open your eyes at 2open
— eye–open·ing /ˈaɪˌoʊpənɪŋ/ adjective [more eye–opening; most eye–opening]
▪ Traveling abroad was an eye-opening experience. ▪ The movie has some eye-opening special effects.
/ˈaɪˌoʊpənɪŋ/ adjective [more eye–opening; most eye–opening] ▪ Traveling abroad was an eye-opening experience. ▪ The movie has some eye-opening special effects.
