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.
So, in Ruby, Sapphire and Emerald, first of all, you want to dive on Route 134 in order to read the inscription at the center of the sealed puzzle chamber. Once that's done, you can capture a Registeel in the ancient tomb on Route 120. So, in Pokemon Platinum, you can find a Registeel behind the door of the iron ruins.