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Lens Layers: Like An Onion

Lens Layers: Like An Onion

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    Any pair of sunglasses instantly makes you look cooler.

    However, do you know that all good sunglasses should have 5 important things?

    Astro Ulagam found a very particular recipe for the sandwiched stack of materials that make up the perfect sunglass!

    Layer 1: Scratch-Resistant Shell

    The entire lens in a layer should protect the surface from scratches and nicks.

    Layer 2: Colored Tint

    Rather than tinting the lens itself which could lead to uneven coloration as a result of the prescription-cutting process, the color should be applied as a separate polycarbonate layer.


    Layer 3: Polarizing Film

    Light reflecting off flat surfaces such as lakes and roads oscillates horizontally, creating glare in situations where sunglasses matter most. So, a thin layer of polyvinyl alcohol with a series of microscopic vertical slits stretches across the lens to cancel out the harsh light.

    Layer 4: Prescription Lens

    A computer-guided diamond cutter contours polycarbonate lenses to ‘script-perfect magnification. The impact-resistant material is needed to filter vision-impairing UV light.


    Layer 5: Anti-Reflective Coating

    A dark, shiny surface tends to act like a mirror, especially in bright sun. To combat this effect, invisible layers of silica oxide, titanium oxide, and zirconium oxide bounce light in a different directions, keeping reflections of your face out of sight.


    Resource: popularscience.com

    Picture credit: gadgetrend.com

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