Sunglasses or Glasses Black has become a daily need, especially in tropical regions. Whether to use when walking on a sunny day, outdoor sports, relaxing on the beach, when driving a car, or just to complement the appearance. Scattered everywhere kiosks and stores that sell sunglasses with a variety of models and prices. Some chose the shops with ‘brand’ that set exorbitant prices for the collection of sunglasses that offer a variety of strengths. Some others prefer to buy sunglasses, cheap in small stalls and various vendors.
What causes such a price difference? Does the high price is caused only well-known name of the designer? What is the secret hidden behind a small object that often give the wearer a sense of mystery this?
The main purpose of the use of sunglasses is to protect the health of the eye. Sunglasses are both generally have layers of anti-reflection coating (anti-reflective) that is attached under the lens or polarized sunglasses (polarizer is applied on the surface of the lens) and equipped with a protective coating and anti-scratch coating mirrors to reflect back light waves near the eye.
Sunglasses that we now know is not necessarily black. These colourful glasses do not reduce performance in protecting our eyes. Photo chromic technology allows the use of bright colours with a material that automatically switches to black when exposed to excessive light. Photo chromic material that is not a color (transparent) when used in the room (no wave ultraviolet). But once exposed to ultraviolet light waves, chemical reactions that change the structure so as to absorb some visible light waves. This is what causes the colour to darken. This process can happen very quickly, and the reaction can be reversed again (when the wave ultraviolet no longer, automatically changing its original structure) with the same speed. Silver halide such as silver chloride is one example of photo chromic materials
All of this advanced technology hidden behind high-quality sunglasses. This is what causes the difference in price with sunglasses that only sells black colour only but can not provide the protection required by our eyes. You can see some clips on sunglasses, so you can choose the appropriate Sunglasses. You can choose Flip-up Clip-On or Spring-fit Clip-On.
