The external epithelial layer of the eye, the cornea and conjunctiva, absorbs virtually all ultraviolet radiation with a wavelength of less than 290 nm. Excessive exposure to ultraviolet radiation is known to cause damage to the eye's outer tissue. The condition most directly linked to ultraviolet radiation exposure is corneal photokeratitis ("snow blindness"). This is caused by acute exposure and is the ocular equivalent of sunburn. Chronic exposure to ultraviolet radiation is linked to conditions such as pterygium (145). The role of ultraviolet B in cataract formation is complex and unclear. Some cataract subtypes are associated with ultraviolet radiation exposure, but others are not.
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Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.