- blind as a bat
- is excessively sympathetic towards other people.Ultimately results in something positive, it's a blessing in disguise.If you are in total darkness and can't see anything at all, you are as blind as a bat.(Dorking School Dictionary)***Someone whose vision is very poor, or who is unable to see anything, is (as) blind as a bat.
Without his glasses, the old man is as blind as a bat.
English Idioms & idiomatic expressions. 2014.