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Feb 24, 2017

Sunglasses, also known as the visor mirror, use as a sunshade. People in the Sun, usually by adjusting the size of the pupil to regulate the luminous flux, when light intensity exceeds the adjustment ability of the human eye, can cause harm to the human eye. Places for outdoors activities, especially in the summer, need for a visor mirror to block the Sun to reduce eye fatigue caused by regulation or the damage caused by light stimulation.

Sunglasses can block the uncomfortable glare while protecting eyes from UV damage. All of this is thanks to the metal powder filters, they can be carried out at the influx of its "choice". Filters to selectively absorb the Sun's rays part band, just because it's a very fine metal powders (such as iron, copper, and nickel). In fact, when lenses are light, based on the so-called "destructive interference", the light has been reduced. That is, when certain wavelengths of light (in this case is UV-a, UV-b, sometimes red) through the lenses, in the direction of the lens inside the eye, they will cancel each other out. Formation of light overlap it is not by chance: The crest of a wave as it is close to the trough of the wave together, leads to cancel each other out. Destructive interference phenomena depends on the refractive index of the lens (light through different substances from the air deviation), depending on the thickness of the lens. In General, the thickness of the lens is small, and the refractive index of the lens is based on the differences in chemical composition but different.

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