The following sections discuss all of the different
technologies currently in use:
1. Antireflective back: A couple layers of coating on the
concave surface of the lens's back that protects the eye from the glare of the
light that's behind you.
2. Tinting layer: Grey is best for viewing true colours.
Yellow is a contrast enhancer and best for outdoor activities in low light.
Vermilion (a rosy-peach colour) is best for overcast days and sports like
skiing. Green and brown are soothing colours that work well in both low and
bright light.
3. The lens: Generally made of glass, plastic, or polycarbonate.
Glass provides the least amount of UV protection but is the most scratch
resistant of the three. Plastic is naturally more effective at filtering UV and
is the cheapest option, but it's the least durable. Polycarbonate is the
lightest and most durable, and it is fully UV protective.
4. Polarization layer: Multiple wafer like sheets that block
horizontal rays (i.e., rays reflecting off other surfaces, like a body of
water) to prevent glare. Interesting note: If both horizontal and vertical
forms of light were blocked, you wouldn't be able to see at all.
5. UV coating: A coating that typically filters out two
types of ultraviolet rays: A and B.
6. Antireflective coating: Multiple layers of various metal
oxides that reduce glare and, in some cases, even repel water.
7. Scratch-resistant coating: Usually made from ultrathin
Teflon polymer, a durable type of plastic that prevents scratches on the
surface of the lens.
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