Traumatic optic neuropathy (TON) refers to an acute injury of the optic nerve secondary to trauma. The optic nerve axons may be damaged either directly or indirectly and the visual loss may be partial or complete.
In Minecraft, emerald ore is very hard to find and is found in small deposits in the Extreme Hills biome. You can usually find emerald ore between 13 and 31 blocks below the ground and close to lava. So if you see a pool of lava in the Extreme Hills biome, that is a great place to start mining downward.
POKEMON EMERALD (What the Pokedream guide misses out (and everyone who has answered so far)): You get a Team Magma Emblem at Mt Pyre. You then go to the Mt Chimney Chair lift and take it up. Once on top, go down the Jagged Pass. As you go down, the Magma Emblem will open up a cave for you to go into. Complete this before you are able to go to Slateport to meet Captain Stern. POKEMON EMERALD (What the Pokedream guide misses out (and everyone who has answered so far)): You get a Team Magma Emblem at Mt Pyre.