We’re often warned about how dangerous small commercial lasers can be for our eyes yet technologies like FaceID projects light in our faces many times a day.
Why is FaceID safe? Because it’s low enough power or because it’s in the non-visible spectrum?
Can the non-visible spectrum be dangerous for our eyes?
In: 40
All waves of light are damaging in the right dosage. If I put your eyeballs in a microwave, they’ll be damaged. If I put them in front of an x-ray machine for long enough, they’ll be damaged. Or in front of a laser at any number of visible or invisible wavelengths.
Anything that the biological material of the eye can absorb will interact with that material. You get enough interactions per time frame and you’ll start doing damage. The eye is alive though and can cool itself with evaporation and blood flow so as long as the dosage stays below a threshold no permanent damage is done.
We’re often warned about how dangerous small commercial lasers can be for our eyes yet technologies like FaceID projects light in our faces many times a day.
Why is FaceID safe? Because it’s low enough power or because it’s in the non-visible spectrum?
Can the non-visible spectrum be dangerous for our eyes?
In: 40
All waves of light are damaging in the right dosage. If I put your eyeballs in a microwave, they’ll be damaged. If I put them in front of an x-ray machine for long enough, they’ll be damaged. Or in front of a laser at any number of visible or invisible wavelengths.
Anything that the biological material of the eye can absorb will interact with that material. You get enough interactions per time frame and you’ll start doing damage. The eye is alive though and can cool itself with evaporation and blood flow so as long as the dosage stays below a threshold no permanent damage is done.
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