because they only see out of one eye.
It sleeps with 2 eyes closed
the eye of a chicken.
she got sumin in her eye
Batty Wood is a Eye Closed!
He has a mental issue
Dance on the table with one eye closed
No, I'm sorry. But if she looks at you with one eye closed, opens it and then winks, then yes. (Though if a girl likes a guy, they usually don't wink.)
Chicken.
go to vet ASAP
your eye being closed
After a long time the brain will decide the eye is bad and quit using it. You will then be blind in that eye. This effect is an example of "use it or lose it".