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.
Some Emeralds are light green or even have a tinge of yellow. Emeralds are made from beryl and include the rare element beryllium. While beryl is a common form of mineral, emeralds are usually very rare. The two trace elements that give an Emerald its beautiful green are chromium and vanadium.