It probably works the same way as for Poser 4! For my female image, i made one set of the eyeballs transparent (there are two sets of eyeballs), and applied the eye textures on the remaining parts (all parts, except for the pupils). Then i copied the irises, and pasted them just in front of the other ones, and added a soft blue volumetric mat on them. Also added a little transparency to them! This last thing made the eyes look more real!

Rudolf Herczog
Digital Artist
www.rochr.com