Sunglasses for UK women can protect your eyes from the glare of the light that is not comfortable. All this is due to the metal powder filter, which can be “selected” when the light comes in “. Glasses can selective absorption component part of the band of the rays of the sun, because it is using the very fine metal powders (iron, copper, nickel, etc.).
In fact, when the light shines on the lens, the so-called “interference” process based on light has been reduced. That is to say, when some wavelengths of light (here refers to the ultraviolet A, ultraviolet B, and sometimes infrared) through the lens of sunglasses with best sales, the inside of the lens that is toward the direction of the eye, they will offset each other. Formation of waves of the mutual overlapping is not accidental phenomena: the wave crest of a wave with its near the wave trough together, resulting in offset each other.
Destructive interference phenomena is determined and the degree of deviation occurred in lens refractive index (i.e., light from the air through different substances), depending on the thickness of the lens of cheap sunglasses. Generally speaking, lens thickness change is not big, and lens refractive index is different according to the difference of chemical composition.