With Robespierre, though, I've come across suggestions that he may have had migraines, in which case symptoms are light sensitivity, aura, fogginess and other visual weirdness: then again, these people were working long hours by artificial light, so must have all been wrecking their eyes!

If it is true that Robespierre was both nearsighted and farsighted, then it would definitely not be surprizing if he suffered from migraines--I would find it highly unlikely if, in the eighteenth century, he had much luck in finding glasses that could do wonders for both.