Crystal lenses are a crafting material primarily used to craft and upgrade weaponry.
"Great for projecting light"
The lenses can be crafted from a single lens and the corresponding gem, each variation can be used to craft and upgrade different weaponry. The three guns that use them in their recipe are the Pulse Rifle (Vaporiser), Blitz Gun, and the Liquid Nitrogen Gun. The lenses also have a chance to drop from certain enemies such as the molten eye, found in the underworld.