When people saw bats fly into walls and/or narrowly miss them. People figured bats were blind and they were right. So whenever someone bumped into a wall, they said they were as blind as bats.
Bats have very sensitive eyes that are pretty much useless if they try to see anything in daylight. This leads people to think that bats have very bad vision.
No, the idiom is "turned a blind eye" as in "she turned a blind eye to his suffering." You don't change an idiom around or you lose the meaning.
Yes they are blind.
To be exposed
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Origin "up a storm"
No
That's not an idiom - it means exactly what it says - there are twelve months in a year.
It is a slang term from the 1930's, origin not known
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