"Blind" doesn't necessarily mean "zero vision". There are a lot of people with vision impairment (legal blindness, but partial sight) who could benefit from these glasses.

For example, the glasses could automatically magnify small text that you are reading. They could speak out directions as you walk around a city. They could help you identify products at the store.

That's just a handful of things I came up with off the top of my head. Consider all of the assistive devices (mostly expensive btw) that are currently being used by the blind (and don't forget the deaf!), and think of how these glasses could augment or even replace what's available now. It could be huge.