This is a generator of procedural eyes (mathematically generated) based on cycles nodes for Blender, this is able to generate both the part of the iris and the sclera. The part of the iris besides the bump map also works as a displacement map, to get more realistic results. With this product you will be able to generate infinite photorealistic quality eyes.
I tested the upbge eevee branch, but not this addon. Game engine (and all legacy) compatibility will be added in upcoming updates. It was made for game engines so I don`t see why it ssould not work Spherical fog will be included as well. For now flat-world physics are used. 2b1af7f3a8