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.
Emeralds are ancient gemstones. According to the oldest book in the world, the Papyrus Prisse, But good words are more difficult to find than the emerald, for it is by slaves that it is discovered among the rocks. This book is 4500 years old, but the passage was copied from a writing 1000 years earlier.