So you want it like the bottom here instead of the top? With the new eye this is easy - just do the transition properly and it will show up on the eye.

Here I did it with nodes, so even a sharp edge can be fixed up procedurally.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)