A Brazilian study shows that sunlight degrades the glasses of sunglasses, making them lighter. As they age, lenses offer less effective protection, which change the category in which they are classified upon purchase.
Researchers at the University of Sao Paulo (Brazil) carried out aging tests by exposing sunglasses to a solar simulator for 50 hours. This exposure is the equivalent of two days of sunshine in summer or four days in winter. They concluded that sunglasses should be changed every two years because beyond that the protection of the retina is no longer guaranteed.
A risk of cataracts and early AMD
According to Professor Liliane Ventura, main author of the study, “Eye health is a major concern, especially in areas where UV indices are extremely high in summer and remain high in winter. The current standard for sunglasses is, for example, not suitable for countries in the world. ‘southern hemisphere like Brazil “.
The doctor recalls that, without sunglasses with effective UV protection (and particularly anti-UVA), there is a risk of developing later a cataract or a Early AMD.
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