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A myth. Every bat species can see. Some see very well.
Where it came from
Bats fly at night and many find their way by echolocation, so it seemed they must not be using their eyes at all. “Blind as a bat” has been an English saying for centuries.
What’s actually true
No bat species is blind. Fruit bats and flying foxes have large eyes and good night vision and most do not echolocate at all. Even the small echolocating bats use their eyes; some set their inner compass by the glow of the sunset before a long flight.
Further reading
- Wikipedia: Bat (Vision)