Eventually a common theme became apparent: Apple’s applications — Calendar, Messages, Mail, iPhoto, even Maps and most surprisingly Camera — are completely usable by blind people. These applications aren’t using any kind of secret API sauce. They’re using the same UIAccessibility framework you and I have access to.
To get your mind blown, fire up Camera and point the camera at a nearby face, preferably a cute infant.
Well I never knew that about the camera app. Thats pretty neat.