Is there any way to have 'no' pupil on Michael?

I am creating the characters in the fantasy novel I'm writing in Poser7 and the one character is a god-like character with bright blue eyes with absolutely no pupil. I have created the texture, but what seems to be happening is that the ambient setting in the materials pane is still leaving the shadow and reflection on the pupil. I've tried all sorts of different colours and transparencies and ambient values, but I can't just make it totally disappear--or at least, I can't find the box to check.

The character is almost done, but this pupil problem is ruining the whole effect.

Thanks in advance for any tips of tricks you may be able to share, as i haven't used Poser in a few years and the material room is a bit tricky still for me. :)