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"True infrared vision (not night vision as some would define it), which most non-human races have, can easily detect invisible creatures."

That's silly, the ROYGBIV normal spectrum of light is bent by the 'magic' but infrared isn't? Bzzt, try again. Now if you have some beastie in your RPG whose primary sense isn't sight but hearing, like a really big bat for example, yon ring doesn't do much good.

Back on topic, LoTR was written for Tolkein's nephew who was if memory serves somewhere in the 10-14 age range. I read it at age 13 (and since it popped up, I read the Narnia stuff at age 10).

LoTR, the early form of what became LoTR anyway, was written in serial form for Christopher Tolkien, the Professors youngest son, while he was serving in the RAF in WWII stationed in South Africa. Christopher was in his early twenties if I recall correctly.

That's silly, the ROYGBIV normal spectrum of light is bent by the 'magic' but infrared isn't?

No infrared isn't. I use the Predator style infrared. Think of that movie. It's based on heat. You can detect heat patterns even when something's invisible.