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.
In Sonic Rush the Chaos Emeralds are necessary to access the final stage of the game. Special Stages make a return as a way to obtain the Emeralds. The Emeralds are shown to have an inter-dimensional counterpart, the Sol Emeralds, with similar powers.