there was a blenders forum that I happend upon and this guy talked about the same thing:

"I have spent some time working on a cycles eye and recently put it on the side as I wasn't getting good results. The roadblock I keep running into is this: The reflections in a real eye seem to only reflect the strong white emmisive portions of the scene, and ignore (or drastically reduce) all other reflections. I tried various cornea glass setups, putting gloss on the iris, modeling the pupil separately but I never quite got it. I felt that the "isglossray" might hold promise, but I never quite figured it out. I've included 3 eyes that show how only the strong whites reflect."

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740