One of the coolest jaw dropping examples of this I ran across not long ago, is Aira (https://aira.io/ - I have no affiliation with the company). First we had Google Glass, with the popularly derided "glassholes" (not a term I approve of using mind you, however it was persistently thrown about in media and on tech forums).

I've known a few people that lost their eyesight. What services like Aira could accomplish is nothing short of life changing for the blind. And it, in part, started out from a concept that was mocked as being representative of supposed obnoxious Silicon Valley priviliged types.