"Eliminate Shadow Artifact" is not suited for eyes
While ON, "Eliminate Shadow Artifact" produces horrible artifacts on eye mesh (screenshot 1). And it is getting worse under certain lights condition Eye should be excluded from this settings.
NVIDIA SDK manual suggests enabling shadow_terminator_offset_mode = on (in CC it equals to Eliminate Shadow Artifacts checked) only in exceptional cases and rather handle odd shadows by tessellating the surface. Because this mode (if enabled globally) might cause some other issues with 2 meshes being too close to each other. This is exactly what happening with cornea/eye geometry (screenshot 2).