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An earth bender as talented as Toph has "seen" things underground that most people never will.
Given how far she can "hear" people screaming through a mountain, it'd be interesting to know the limits of her "vision".
Like we saw that she can "see" farther if she's on solid ground, and if she concentrates on the solid floor or something connected to it.
We also saw she can increase her "vision" by punching into the rock and (using a few assumptions here) using the vibrations of the strike combined with more of her skin being in contact with the stone.
So could she use a large metal ball to smash into the earth to "see" a super long distance? Could she see huge cave systems in mountains? Could she locate lost civilizations from miles away?
Also, what does an earthquake "look" like?
So many things sighted people will never know.
By the time of korra she can see everything in earth
I think the mystical properties of the banyan tree help there, but, yeah.