Black music stereo intelligent glasses wireless phone/ can make a phone call

Black music stereo intelligent glasses wireless phone/ can make a phone call

Sunglasses, also known as sunshades for shading purposes. People in the sunshine usually rely on regulation pupil size to adjust the flux, when the light intensity exceeds the ability to regulate the human eye, it will cause harm to the human eye. So in outdoor activities, especially in the summer, we need to block the sun visor mirror to reduce eye fatigue or light stimulation regulate the harm caused.

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 "choice" when the light strikes. Colored glasses can selectively absorb some of the sun's rays band composition, because it by means of a very fine metal powder (iron, copper, nickel, etc.). In fact, when the light shines on the lens, based on the so-called "destructive interference" process, the light was cut up. That is, when certain wavelengths of light (in this case is an ultraviolet a, ultraviolet b, sometimes infrared) passes through the lens, the lens inside the eye that is toward the direction, they will cancel each other out. Forming a lightwave overlapping phenomenon is not accidental: a wave trough wave crest with its close together, it led to offset each other. Destructive interference depends on the refractive index of the lens (ie, the degree of deviation occurs when light passes through different substances from the air), also depending on the thickness of the lens. In general, the thickness of the lens changes little, while the refractive index of the lens is based on differences in chemical composition and different.