The Optometrist Eyeball Glass Pipe is our original eye sculpture design. It was so popular that we designed our Cyclops after it. The difference between the 2 is that this piece is color change fumed. Both the glow version, as well as the straight color change, have silver fuming, so they will change to blues and greens with use. The nice thing about glow vs UV reactive glass is that glow will react to UV as well, and you don’t need a black light to get it to glow in the dark.