Fran, sorry, I didn't see this, as my site email was kaput. No, I don't remember anything more except that I used the eye material on the sphere and tried to make the booleaning light to be as big as the blue "iris" in the material. I also remember I had to make some effort with the exact positioning of the light. And I apparently didn't save the file. I have just that screenshot from a year aago.

-- erlik