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.
Same with the Pocket Edition, even thought that you can't mine them because a lot of stuff is not yet added in the game. And as for the link, if there should be anything different then it probably would be added in minecraft wiki on the day minecraft came out. And diamond can be found in layers 1-15. http://www.minecraftwiki.net/wiki/Diamond_Ore. http://www.minecraftwiki.net/wiki/Diamond_%28Gem%29.