I think this shows your unfamiliarity with the world of disability, padawan.
Most disability is navigable, blindness included.
Unfortunately, I am not unfamiliar with the world of disability. My father has been registered blind for 20 years, and my mother was crippled through illness for several years prior to her death. I was her carer, and had to dress, bathe and otherwise look after her. One of the less pleasant examples of that was having clearing her laryngectomy stoma of mucus with a suction pump throughout the day. I was also my wife's carer for the 2 years it took her to recover from a subarachnoid haemorrhage that left her paralysed down the left side of her body. I am no specialist nurse, but I feel I have at least reasonable familiarity with various forms of disability. Whilst we are putting cards on table, I did ask above what the life changing injury you suffered was, as I do think that if you're claiming to have endured something similar enough to the deceased to call him weak, it'd be reasonable to specify what that was.
Navigable is a vague term, that really does not mean much. For instance,
Phil Packer lost all feeling and use of his legs, but was able to complete a marathon on crutches. There is the rather famous case of
Oscar Pistorius, born without legs, but capable of running 100m on his prosthetics at a time I doubt anyone on this board could match. Clearly aids exist for such disabilities that go far beyond making them "navigable"
Whereas lose your eyes, and really all you have are coping strategies and very limited aids. Braille, audiobooks, white stick, guide dog...these really aren't offering anything even close to the return of abilities that the cases above show. Obviously people can and do adjust, but in this case the deceased had stated he was battling with depression. For whatever reason, it overcame him. That happens to some people, and may not indicate weakness. As a counter point, I have seen it claimed that more
Falklands veterans have committed suicide than died in the conflict. Do you feel that all of these people were also weak, and deserve to be scorned?