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Blind as a bat

1. Old wive's phrase for one who is of poor eyesight. Actually a common misconception, as most bats (of the mammalian sort) have better eyesight than the average healthy human being.
"Hey four-eyes! You're as blind as a bat!" - Stupid Jock
Blind as a bat by Track-10 January 14, 2003

as blind as a bat 

It is saying that you have the vision of a bat.
"you're as blind as a bat"