For the eye shading, it is possible to split the eye occlusion material into two materials that apply the “Blur” part and the “Shadow” part of the Eye Occlusion individually. The “Blur” material (which reads back from the scene with fog already applied) can then be set to not apply fog, the shadow part (which can be implemented using a Modulate blend mode) can be set to still apply fog so that it responds correctly.