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Why is the IR part of the spectrum better for the cameras? Is it because if I take an image of my eye and look at the IR part of the spectrum is it just easier to see parts of my eye that determine where it's looking?

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IR is better because you can provide illumination via IR flood lighting that isn’t visible by the human eye.

This is effectively how the FaceID system on your iPhone can work regardless of lighting condition.

That means that even in dark situations, you can have much higher quality imaging , albeit in a limited range.

Ah, interesting! So you can ensure you get illumination on the eyes w/out shining annoying, visible light at them. Very cool.

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