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.
It can also be used to craft Blocks of Diamond. It is obtainable from Diamond Ore and does not require smelting (unless mined using the Silk Touch enchantment). One diamond can be collected from a diamond ore when it is mined, unless using a Fortune enchantment. Diamonds are considered one of the most valuable items in the game due to their rarity and usefulness as a hard crafting material. Tools and armor made from it are the most durable and strongest in the game. Diamonds, like creepers, have become iconic to the game. Diamonds can be found in a variety of places, but tend to be commonly found near lava beds underground because it is commonly found on the same layers as lava beds. They are the 3rd hardest mineral in vanilla Minecraft. Diamonds are the second rarest ore in minecraft, the first being Emeralds.