Along similar lines, I think about this for any post apocalyptic scenario that disrupts supply lines. Even if things are okay in terms of food, I regularly take medication that one would presume would be hard to get without modern society. In that situation, if I broke or even scratched my glasses, it seems very unlikely I would find functional replacements. I’m not physically disabled, but I am very limited, so in any real conflict I would lose. Quickly.
In prehistory or any future environment like that, I wouldn’t last long.
edit: Better image source.