Could you approximate number of blind persons using AI?

If their number is significant, they could themselves be foundation for some AI business, even if all other consumers will turn away from AI.

For about accessibility of web, must say it is terrible even for non-blind person, but AI could also change this to better.

What I mean, you may hear about PalmPilot organizers, they was very limited in hardware, but existed private company, which provided proxy-browser, which input ordinary web sites and shown on PalmPilot small display optimized version, plus have mode for offline reading. With existing AI now could do much better.