open somebody’s eyes to something

otevřít oči

It is through patient persuasive reasoning together with voluntary suffering that they must seek to melt the heart of his opponent and open his eyes to the truth.

Daughter of the Queen Igrayne and half-sister to King Arthur, she revealed to him the intrigue between Lancelot and Guinevere by giving him a magic draught which opened his eyes to the perfidy.

Oh, you’ve repaid him: you’ve opened his eyes to things that’ve been under his nose, and he couldn’t see the wood for the trees.

(BNC-B)

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