What is C shield for glasses?

In the 80’s and 90’s, anti-reflective AR coatings had an individual layer which would craze, scratch or smudge easily. Today’s AR coatings carries a harder layer of scratch resistant coating, besides oleophobic (anti-oil), hydrophobic (anti-liquid), and anti-static layers. These extra layers help to repel the things that lead to smudging and scratching.

Any of the above features, color, polarization, gradation, mirroring, and materials, could be combined in to the lens for a set of sunglasses. Gradient glasses are darker at the top of the lens where the sky is viewed and transparent in the bottom. Corrective lenses or glasses could be manufactured with either tinting or darkened to serve as sunglasses.

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• Today’s AR coatings includes a harder layer of scratch resistant coating, along with oleophobic (anti-oil), hydrophobic (anti-liquid), and anti-static layers.
• Rather than tinted lenses, they decrease sun exposure by means of a couple of parallel, horizontal shutters .
• Sun-shades can also make reference to the sun-shading eyepiece-type, even though term is not exclusive to these.
• Some opticians may provide a choice of “good, better and best,” with the best grade being somewhat more expensive.

Sun-shades can also refer to the sun-shading eyepiece-type, although the term isn’t exclusive to these. Double gradient lenses are dark at the very top, light in the middle and dark in the bottom. These were first made in the 1960s as variants of the Aviator model, utilized by Yoko Ono and Clint Eastwood in the Dirty Harry films. The modern variant surged in the mid-1980s, heavily using the then-popular Wayfarer, but adapting it to a far more