I don’t have any vision problems, so I’m hardly an authority, but Microsoft has a high contrast theme built into VSCode that you might be able to borrow colors from. It looks like this:
It highlights
local differently from the other keywords because of how it’s scoped (it’s a storage modifier according to VSCode) but that’s probably not necessary for Roblox.
There are also high contrast variants of Monokai that you could use.