Ultraviolet Rays Can Cause Photokeratitis Or Ultraviolet Keratitis
San Francisco, California
May 17, 2014 9:08pm CST
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.Purchasing sunglasses, hats, T-shirts and iPhone cases from our shop will make you surprise.Don't miss the chance, shop now!It is very easy to shop on Looksunglasses.Being sold at a good price.The shipping cost is cheap.It arrived quickly and was in great condition.I would recommend to others.Extremely satisfied with product availability.It is amazing to be able to replace Oakley Polarized sunglasses bought for a long time.
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