I just did a search on "blind person using computer" most used keyboards, some also used voice tools built into the OS. Whats the throughput on existing B2C too

I just did a search on "blind person using computer" most used keyboards, some also used voice tools built into the OS. Whats the throughput on existing B2C tools? I see research but not anything I can buy right now. Actualy, if you receive input data faster than you can process and think, wouldn't that in effect just be a program telling you what to think and do? You could resist, but not be able to independently decide what to do anymore than if a room full of people were shouting at you 24/7.