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New test needed to assess the quality, safety of sunglasses

Exposure to the sun may deteriorate your sunglasses over time and the lenses may become lighter and so alter the category under which they are classified. It may also diminish the impact resistance of lenses (how ‘shatterproof’ the lens is). Revision of standards is needed to test sunglasses quality and establish safe limits for the lenses’ UV filters, according to new research.

Source: www.sciencedaily.com