A good friend of mine is blind. As I learned through him and others over the years, blind people are far more capable and adaptable than is commonly assumed. They also tend to cultivate a proud determination to be independent, capable, and self-supporting. It is quite possible that the blind IRS computer tech who examined the hard drive is equal in his abilities and performance to anyone else in the field.
Or not.
I'm not even sure how a blind person would become a computer tech. Most of our job involves seeing things. Anything is possible, but it would be an enormous uphill battle.