believe one's eyes

Meaning: (idiomatic,chiefly in the negative)To believe that something which onedirectlyseesistrulythe case.1884,Edward Payson Roe, chapter 59, inNature's Serial Story:[H]e could scarcelybelieve his eyesas she appeared on the floor unsurpassed in beauty and grace, her favor sought by all. Was that the simple girl who[…]had leaned against his shoulder?1914,Zane Grey, chapter 3, inLight of the Western Stars:She was so amazed at the change in him that she could notbelieve her eyes.2004July 5, “Charisteas: We are the Best in Europe”, inSofia News Agency, Bulgaria, retrieved27 August 2013:Millions of Greeks worldwide erupted in joyful celebration, hardlybelieving their eyesafter Greece beat hosts Portugal in the Euro 2004 finals.

Examples:

EN: Well, I-- well, one can't always believe one's eyes.
ES: No siempre podemos dar crédito a nuestros ojos.

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