she is Kimberly Aka Taylor...
though I new her for a long time I never noticed that she had such an eyes. Now I looked at other photosets, and it is always the same: one eye is more brown, the other more grey. do not think that it is due to the lenses.
I don't think that's a lens, it looks like genuine partial heterochromia.
Personally I think it's beautiful. Kate Bosworth, Elizabeth Berkley, and Mila Kunis have it.