The sunglass is a type of eyewear that has dark lenses. The dark lenses are used to block the UV ray from the sunlight. It protects the eyes from being directly exposed to the sunlight. When the eyes are exposed to the sunlight, it has a higher risk of contracting with diseases. Some of the diseases that are associated with the high exposure to the sunlight include eye cancer, cataract, and blindness. The skin near the eyes can develop cancer when it is exposed to the sunlight for more than 4 hours per day. With sunglasses, you don’t have to worry about your eyes being susceptible to the diseases. When you are driving, the sunlight can reflect from a flat surface such as water and land. The polarized lens is designed to reflect the sunlight from the surface of the water and highway. Polarized lens is able to block the sunlight that is refracted horizontally to your eyes. The polarized lens consists of a chemical film that has a plastic or plastic surface. The type of chemical that is used to make the chemical film has molecules that are aligned with one another. When the chemical compound is applied on the lens uniformly, the molecules will provide a filter to absorb the polarized light ray ban eyeglasses. Another type of popular lens that is often used to make sunglasses is the photochromatic lens. The photochromatic lens can automatically darken when the sun is exposed to it. The lens will only automatically darken when it is exposed to the ultra violet ray. When you are indoor again, the lens will return to the original state. Mirror lens has a reflective coating that can refract away the sunlight. The reflective coating is thin and applied on the surface sparsely. Because the reflective coating is thin, it is often referred as a half silvered surface. The half silvered term is derived from the fact that coating is distribute so sparsely that only half of the molecules are necessary in order to create the opaque mirror. It is best that you shop online for sunglasses. When you shop online, you will be able to choose from a wide range of sunglasses. Besides, the sunglasses sold at the online stores are always cheaper than the usual prices. You can save money when you shop at the online stores. If you want to shop online, you can use the search engine to look for sunglasses stores. To look for sunglasses stores, you have to enter the keyword “buy sunglasses” or “sunglasses stores” in the search box in the search engine.