Snow angels

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Originally Posted by Roa_Aoife

It seems to me that Nazgul cannot see visible, or "White", light. If they could, they would see the living as more than just shadows. You see, cameras designed specifically to pick up UV light and nothing else will almost always create "black and white" photos, or "shadowy" looking objects. This being the case, I could believe that Nazgul see in UV, but not in Infrared. The wavelengths are far too different and on opposite sides of the visible spectrum. It wouldn't make sense that they could pick up light of such widely different wavelengths, but not the wavelengths in between.

We could assume that, as once being human, the Ringwraiths could see in the visible spectrum, but as they began to fade, losing their physical eyes, they learned to sense radiation in other spectrums. Now, to say that the Nazgul could see in both IR and UV might be wild speculation, but I have seen that others have created tools (cameras) that do the same, as noted here.

I'd sleep much better at night knowing that one of these cameras was watching over that foggy area next to my house, as one never knows what could come creeping out that might remain unseen until it was too late...