When you cease being visually-able, you don't cease being an
able person.
In fact, if you're blind, you may actually be able to see what the
average person cannot see, and perform certain tasks better than
the average person. Such as playing music.
If you think that you're better off dead if you're blind, then by
all means go and seek death. Not because you're blind and thus a
burden, but because you've lost the will and courage to tackle
adversity and thus you're a burden.
