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Neywiny 4 days ago

It's incredibly important to understand that eyes and glass have different optical properties at these wavelengths. It's hard to conceptualize because to us clear is clear, but that's only at visible light. The same way that x-rays and infrared and other spectra can show things human eyes can't see, or can't see things visible light can see, it's a 2 dimensional problem. The medium and the wavelength are both at play. So, when you have the eye which is known to absorb such light, and artificial optics which are known to pass it without much obstruction, they're going to behave like opposites. Imagine if the glass/plastic they used in the car blocked the light. Wouldn't really work.

There is a flip side to this though. Quick searches show that the safety of being absorbed and then dissipated by the water in the eye also makes that wavelength perform worse in rain and fog. I think a scarier concept is a laser that can penetrate through water (remember humans are mostly bags of salt water) which could, maybe, potentially, cause bad effects.