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.
Trivia. 1  They are technically rarer than Diamonds, but can't be crafted into any tools or armor. 2  The gem itself isn't rare, as it can be obtained through Villager trading. 3  The Emerald was originally going to be Ruby.  Emeralds can be found in Igloo chests, Desert Temple chests, Jungle Temple chests and End City chests.