What is the origin of the idiom "not believe one's eyes" and when to use it?

The idiom "not believe one's eyes" is used when someone is astonished, shocked, or surprised by something they have seen or heard because it seems almost too extraordinary or unbelievable to be true. It's a way to convey one's amazement or incredulity at a surprising situation. The origin of this phrase is not precisely documented, but it likely originated from the idea that seeing or hearing something incredible might make one question the reliability of their own senses.