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.
This article is on the Chaos Emeralds found on Mobius Prime; you may be looking for the Super Emeralds or the Black Emerald from that same Zone. For the gems featured in the Sonic X Zone, see Chaos Emerald (Sonic X). The seven Chaos Emeralds. Chaos Emeralds are magical gemstones containing infinite power. Although they've been depicted in a variety of colors and quantities, there are typically seven distinct emeralds: peridot (green), aquamarine (cyan), sapphire (blue), ruby (red), amethyst (purple), topaz (yellow), and diamond (grey).