If he thought being a software engineer was what he wanted to do to live a fulfilling life before his diagnosis, why would that change now?
Basically, the GP is telling the OP to consider all of his options and not to box himself into software engineering just because that's what he does now.
I'm blind myself, and I consider software-engineering to be one of the nicest options out there, at least in my country. Sure, there are difficulties, but not as many as in other fields. Computers can be accessible, and accessible tools can usually be found.
A blind person becoming a software engineer is a realistic option. a blind person becoming... almost anything else is not. As a blind person, career prospects are pretty limited, and someone who already is a software engineer has a huge advantage, compared to someone who i.e. invested n years of his life into becoming a surgeon.