Quote - I have bought Octane Render + Poser Plugin last week. Results are impressive in some parts but I'm still struggling to get realistic and bright looking eyes, specially with reflection eyes on daylight environment.

I've tried to modify default eyes materials with no real success.

The trick here is to decrease opacity on the eyesurface to 0.7 or lower.
Try that and work from there.  I think the eye materials in a gen4 figures need to be carefully tuned to eachother, so to get a perfect match will be quite challenging (if at all possible with the choice of eye material zones in gen4)

I also think you will have better results with the PMC kernel - it tends to do specular surfaces better