open (one's) eyes
1. To see or realize the truth about something. Open your eyes, Stan—they're just using you for cheap labor!
2. To cause one to see or realize the truth about something. The documentary really opened my eyes about the conditions in that country.
open your eyes
If you open your eyes, you suddenly make an effort to notice things that you had not noticed before. Every city has its problems. You have only to open your eyes to see them.
open your/somebody’s ˈeyes (to something)
realize or make somebody realize the truth about something: The trip to China really opened our eyes.He opened my eyes to the beauty of poetry. ▶ an ˈeye-opener noun: The programme on police methods was a real eye-opener for me.