Need some help with eye-material

Hey guys, I need some help with my eye material!
I’m still fairly new to creating materials, and so far I’ve gotten a hang on hair but I’ve still got no clue when it comes to eyes. So currently my eye material of my sculpt looks like the first picture, where the material in direct light picks up light fairly good, but when not in direct light it barely picks up anything at all. In the second picture you can see my material nodes.

What should I do? Is the problem non-material related (ie is it the lighting of the scene that’s the problem) or is it because I’ve messed up somewhere in the material? Also, sorry if the pictures aren’t good, this is my first time posting on this forum and I wasn’t sure how to upload pictures!!