A quick merge of a few morphs that improve the realism of eyes by rounding the cornea and shrinking the iris. Default eyes look a little bit Sims 2.
Can find it in the Morph/Head/Eyes category. I didn't get any clipping in testing, but if you do, you can reduce the cornea curve morph until it disappears.
I also suggest switching sclera materials: some of the standard ones are much more realistic than the default.