What is the literary device for "our eyes opened" when describing a realization?

This is a quote from the book Night, by Elie Wiesel. In context: "We realized that we were not staying in Hungary. Our eyes opened. Too late."


Solution 1:

To open one's eyes is an idiom:

to begin to notice or be aware of something important. You need to open your eyes and face the truth.

Merriam-Webster

The next step: to open one's eyes to something is to realize something.