As a natural eye protection mechanisms, it can absorb all the cornea of the eye and the vast majority of UV-B ultraviolet A. However, there is still a part of UV-A will reach the Tiffany and Co Charm Bracelet Jewelry Outlet lens of the eye. A long time to absorb ultraviolet rays may cause cataract, cornea to the retina through a small amount of UV-A can lead to macular degeneration, which causes macular degeneration is the leading cause of blindness for the elderly. Long-term exposure to intense ultraviolet light can cause eye cancer or actinic dermatitis, which is the retina burns. This often happens after a sunny outdoor winter snow, snow reflect the sun's glare, which is often called snow blindness.
Sunglasses have good UV coatings, UV radiation can be eliminated, and you must ensure that one hundred percent of your sunglasses can filter out two kinds of ultraviolet rays. The label on the sunglasses should indicate the extent to which the sunglasses provide UV protection, and you need to be protected. Tiffany and Co Necklace Jewelry Outlet Store Sunglasses nominal vertex values, deviation or assembly of lenses and lens manufacturing time frame does not match, there may be bias vertex, if beyond a certain range, the wearer may feel visual distortion, severe then will affect the wearer's visual health. If the lens has a prism, it will produce visual shift of focus, if more than the standard allowable range, it may result in binocular vision can not be one, or produce low sense of imbalance, increasing the wearer's eye muscle and optic nerve disorderly regulation can lead to serious neurological disorder or adjustment arising strabismus.
Light transmittance of the project is an important indicator to characterize the function of sunglasses. China's current classification standards here feature Fake Oakleys Frogskins Sunglasses Cheap for Sale sunglasses, while the European and international standards will be divided into multiple categories. If you use light-colored sunglasses for shade purposes, the wearer will not get good results shade, such as prolonged outdoor activities in strong sunlight, the wearer will be stimulated by strong light and fatigue. Light-colored sunglasses generally play a decorative role, or the sun is not strong indoors. On the contrary, in the room or do not need a place to wear sun block intense sun mirror, the pupil is due to excessive amplification discomfort, fatigue and so on. In the sun mirror, the transmission is not suitable for small products worn by the rider or car, because the rider or motorist traveling faster than the speed of pedestrians, the transmission ratio is too low will affect their ability to respond.
When the sunglasses meet this requirement, it reached the most basic requirements of protection, that is also a barrier to block the glare of the corresponding amount of ultraviolet light, wear sunglasses or at least not increase the amount of UV light to accept, wear sunglasses, will reduce the flux into the human eye, causing the wearer to increase pupil, under the same external conditions, if the appropriate amount of Cheap Mac Cosmetics Makeup wholesale Outlet sunglasses can block UV light, the human eye will accept more than not wearing sunglasses when ultraviolet light. Clearly defined UV sunglasses lenses used must not exceed the maximum transmittance. UV performance is an important indicator of sunglasses, a pair of sunglasses with UV function if we can not distinguish with the naked eye. The current product performance standards for UV only basic requirement that the wearer harmless. Protection mainly made explicit commitments by the manufacturer, but not all products have anti-UV sunglasses function as a consumer to identify whether the product has anti-ultraviolet function, only the factory to express commitment to the product as the only reference.