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Had this conversation with someone who chose to no longer be at my table after meeting a blind NPC
(files.catbox.moe)
Another player who was at the table during the incident sent me this meme after the problem player in question (they had a history) left the group chat.
Felt like sharing it here because I'm sure more people should keep this kind of thing in mind.
In 5e, even poor people still get 2sp a day. It's not clear how much it costs to hire someone to cast spells, but it's either something they could reasonably pay for to cure blindness, or it's so much that players can make enough money casting spells that money becomes a non-issue even at fairly low levels. Also, that's not going to work if you want an NPC that is blind instead of was blind until they met a PC who had a spare second-level spell slot.