Im struggling to make Realistic Eyeglass Lens in Cycles. I did some research about Eyeglass lens, the lens that used in refference is polycarboante plastic lens (CR39) with IOR 1.498. As you can see in first pic the glass seems darkening the eyeball lens behind it, why its happening?.
I use 2 material in lens (second pic), The gloss one is applied to the edge of the lens ,because the lens edges not as refraactive as the front and back lens side, I could be wrong anyway, please look at the node. Any help would be so much appreciated.