I noticed the irises looked weird in OOT's hair promos and took her for a spin. Sure enough, the irises are concave where they should appear to be convex:

In reality the iris is almost a flat surface with a mild convexity to it that's exaggerated by the refraction of the cornea.

Looking at LF's materials and wireframe, the eye geometry doesn't appear to have a cornea at all, just a surface so it doesn't look possible to alter a refractive index in a shader, and there are no morphs in the base figure to correct the iris shape.

Believe it or not this is something I noticed immediately because, well, people gravitate towards testing how canny or uncanny a render is by looking at the eyes first. Where would someone file a bug with the developers? I haven't had a chance to take LF through all her paces yet but I look forward to doing so soon.