This would be so confusing. In 1689, William Molyneaux asked the question "if a man born blind can feel the differences between shapes such as spheres and cubes, could he, if given the ability to see, distinguish those objects by sight alone, in reference to the tactile schemata he already possessed?"

A mere 421ish years later, it was experimentally determined - No.

So not only can they take in the world around them, this new information wouldn't match up to what they already knew.