Got to be honest - the vast majority of Poser users would expect eye textures to come in a MAT file. You could then add specularity settings. In the attached pic I added an anisotropic highlight to the cornea, but that only works in P5. If you stick up a post in the merchant forum, someone will probably make you up some MAT files in exchange for a copy of the product. To be a bit brutal (and no offense intended) I'd want to see a lot more detail in the textures before spending money on them.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire