How does the iris scanner work through sunglasses?

berfles

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Dec 31, 2011
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I just found out the iris scanner has zero issue working through my polarized Maui Jim sunglasses. Can anyone explain that?
 

bbgpsuser

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To the sensor the addition of sunglasses is something like changing the lighting conditions. The patterns on your irises don't change when you add sunglasses.
 

CKwik240

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I just found out the iris scanner has zero issue working through my polarized Maui Jim sunglasses. Can anyone explain that?

The Iris scanner uses infrared light to scan your Iris. Most sunglasses lenses are made of polycarbonate. It transmits most of the infrared spectrum. It's unlikely the manufacturer put any thought into blocking IR light when choosing the filters. The polarization will cut down all light transmission by 50 percent, but if likely not enough to hinder the scanner.
 

berfles

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The Iris scanner uses infrared light to scan your Iris. Most sunglasses lenses are made of polycarbonate. It transmits most of the infrared spectrum. It's unlikely the manufacturer put any thought into blocking IR light when choosing the filters. The polarization will cut down all light transmission by 50 percent, but if likely not enough to hinder the scanner.

Mine are glass but I see your point. I did t know how polarization affected IR. Just odd that it didnt even slow it down at all.
 

CKwik240

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Mine are glass but I see your point. I did t know how polarization affected IR. Just odd that it didnt even slow it down at all.

I just looked it up actually and turns out most polarizing filters for light only affect the visible spectrum. In which case there would be no reduction in the amount of IR that is picked up by the scanner. But I also know that the Iris scanner works through tinted lenses. Had very few issues with it with my sunglasses or the tinted visor on my motorcycle helmet.
 

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