I don't have exact stats. What I can say is that the majority of the people I know work in situations where computer technology is important. The majority, as far as I can tell, would be around office work and working within organizations. It doesn't stop people. The technology now is so amazing. People with disabilities are doing so many things. I know in the United States there's a medical doctor who is visually impaired. We have two partially sighted researchers in Canada working in research for cancer. There's really no limit to what someone with a visual disability can do if the technology is there to help.
On March 5th, 2013. See this statement in context.