Oh, I would argue that it is a marketable asset. Depends on your prospective employer.

In e.g. Austria regional or communal government, or agencies working with them, would gladly pick you up, give you a protected workplace and enlist you to help make all the e-government sites and processes more accessible.

I'm not simply claiming this. I used to work with a 100% blind developer, that had a degree from Uni Innsbruck in either Computer Science or Mathematics, I don't remember really. I could not understand how he managed to get a degree (in the 80ies or 90ies nonetheless), but even if he needed special tools, he was a very important asset in the whole e-government push, especially because he was apparently a very valuable software developer, albeit his challenges.