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.
Real emeralds will not display a good amount of fire, it will be very low. Therefore, if the emerald shown to you emits hues of rainbow colors and resembles the brilliancy of a diamond, is it probably not real. In high-quality emeralds, the inclusions should not affect the clarity of the stone.