When the sunglasses after using for a long time, his uv filtering effect is still the same?

If you have a favorite sunglasses, you may have to use them for years. Use the sunglasses for a long time still can protect the eyes from ultraviolet ( UV） The damage? Recommended reading: sunglasses exposure happened after 50 hours. 。 。 。 。 。 The study did not directly answer the question of whether uv protection deterioration. The only way to be sure is to test your sunglasses. Have recommended sunglasses will filter out all the uv protection. Ultraviolet rays can damage the surface of the eye tissue, the cornea and lens. With the passage of time, the uv damage increases cataracts, the risk of macular degeneration and other eye diseases. These things can reduce your vision. A study from the university of Sao Paulo, Brazil, 2016, looked at the sunglasses UV protection is fully tested. Morin center at the university of Utah, an assistant professor of ophthalmology, the American academy of ophthalmology spokesman Jeff Pettey physician said, 'this disappearance and testing whether the uv protection sunglasses will be different. 'Researchers have found that Brazil's manufacturers test might underestimate over time will cause the amount of uv radiation to the glasses. It is not clear whether the findings in the American sunglasses test what it means. Brazil's ultraviolet (uv) radiation exposure levels of exposure rate is higher than the United States. Although the study put forward more questions than answers, but, says Dr Pettey, consumers should not panic or eager to change their favorite color. No one suggested use sunglasses when he retired. In recent years, uv blocking technology improvements. Today most of the uv protection sunglasses are embedded into the lens, not besmear is on the lens. If you worry about the age of the sunglasses and security, can be equipped with uv photometer store had tested. If you are ready to buy a new pair of sunglasses, Dr Pettey provides the tips, can choose the most protective sunglasses: looking for a label, it says '100% prevent UVA and UVB rays' or '100% uv protection, 400'. The larger framework of the skin around eyes and overlay in the options. Wrapped in framework provides maximum protection on either side of the face.