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.
Actually it does have a lot to do with XP the more you have the more you find ores. Proof- When I was level 36 I found 3 diamonds and 4 emeralds, I died and now I'm level nine and have only found 4 gold tons of iron and no diamonds LOL NOOB!