not believe eyes

not believe one's eyes

Fig. not to believe what one is seeing; to be shocked or dumbfounded at what one is seeing. I walked into the room and I couldn't believe my eyes. All the furniture had been stolen! When Jimmy opened his birthday present, he could hardly believe his eyes. Just what he wanted!
See also: believe, eye, not

not believe your (own) eyes

to think that something you see is not likely to be real She looked so different in a uniform, I couldn't believe my eyes.
Usage notes: sometimes scarcely or hardly are used instead of not: When he found the ring in the grass, he could scarcely believe his eyes.
See also: believe, eye, not