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.
Rare Blocks. 1  Emerald Ore - A new block that only generates in one biome, and generates between three and eight blocks per chunk. 2  Beacon Block - An item crafted from the Nether Star. 3  Sponge - Found only in ocean monuments and dropped by Elder Guardians.  Ice - can only be mined with a silk touch pickaxe, can only be made in a snowy biome. Packed Ice - A more compacked version of Ice, but doesn't melt in Torch/Glowstone light, only found in the rare Ice Plains Spikes biome, and obtainable only with silk touch enchanted Pickaxe. Prismarine - Only found in Ocean Monuments.