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Ultraviolet (UV) light is electromagnetic radiation that is invisible to the human eye.Its name is derived from the spectrum of electromagnetic waves with frequencies higher than those that humans identify as the color violet. The sun emits ultraviolet radiation in the UVA, UVB, and UVC bands.The Earth's ozone layer blocks 97-99% of this UV radiation from penetrating through the atmosphere, and UVC rays rarely reach the Earth. UV rays are also emitted through other sources, such as welding machines, indoor tanning beds, and lasers.High intensities of UVB light are hazardous to the eyes.Exposure of insufficiently protected eyes to ultraviolet rays can cause Photokeratitis or ultraviolet keratitis, a painful condition of the eye.This is similar to a sunburn of the cornea and conjunctiva, and is not usually noticed until several hours after exposure. Photokeratitis may be painful and include symptoms such as red eyes, a foreign body sensation or gritty feeling in the eyes, extreme sensitivity to light and excessive tearing. Some contact lenses have UV protection, but you should still wear sunglasses because UV rays may affect the eye tissue that is not covered by the contact lenses.UV rays can be of great harm to the eyes as well as skin.With the help of Earth's ozone, most of the UV radiation can go through the atmosphere, reducing the harms can be done to human beings. But these lucky "escapers" are able to cause eyes diseases by the latter's exposure to the former.So taking actions to protect the eyes against the sunlights is important.Contact lenses have some anti-radiation function, but the left part of the eyes are exposed to the rays.It is better to wear sunglasses when one wears contact lenses.We boast our impeccable quality and competitive price, just shop at this sunglasses online discount store.Product was easy to find on their www.looksunglasses.com.I was completely satisfied with the product.Get job and super service on this company part! You order process is easy and intuitive.The shipping cost is cheap.Got a detailed tracking number or shipment confirmation.Extremely satisfied with product availability.It is amazing to be able to replace Oakley Holbrook men sunglasses bought for a long time.