Definition
To suddenly understand something that you did not understand before, usually a truth or reality that was previously hidden.
After years of research, the scientists finally had the scales fall from their eyes and understood the real cause of the disease.
When he saw all the evidence, the scales fell from his eyes, and he realized that he had been deceived all along.
As she gained more experiences, the scales fell from her eyes, and her view of the world became clearer.