The expression “as blind as a bat” comes from the belief that bats are blind. In fact, bats can see about as well as humans in daylight. It is at night that they cannot see with their eyes. But then, they can “see” with the help of sound waves. They use sound waves so well that can catch flying insects at night.
It goes without saying that “as blind as a bat” means having very poor eyesight. “That man is as blind as a bat. How can he do reading?” The idiom can be a figure of speech: “The manager is as blind as a bat ---all those obvious drawbacks have escaped him.” Here the idiom refers not to the manager’s eyesight, but to his poor judgment.
It goes without saying that “as blind as a bat” means having very poor eyesight. “That man is as blind as a bat. How can he do reading?” The idiom can be a figure of speech: “The manager is as blind as a bat ---all those obvious drawbacks have escaped him.” Here the idiom refers not to the manager’s eyesight, but to his poor judgment.
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