The Secret Behind Adjustable-Tint Lenses At the heart of these groundbreaking sunglasses is variable neutral density (ND) filter technology, a tool cherished by photographers for its ability to ...

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The color of your shades can affect how sunlight filters in through your sunglasses ... or certain eye conditions. Pink or red-tinted lenses are ideal for depth perception, according to Hunting ...

It’s taken centuries for this humble accessory to morph from Inuit snow goggles to medieval Chinese quartz lenses to 18th-century tinted ... sunglasses have retained their “cool factor” thro ...

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So, why not use them for adjustable-tint sunglasses? Well ... As it increases, the brightness of the light passing through into the lens is reduced by an increasing number of f-stops – the ...