UV protection concerns
UV rays (ultraviolet) consist of three kinds, UVA, UVB and UVC. AS UVC cant reach earth, been blocked by earth atmosphere, UVA and UVB are the main concerns. UVA is absorbed by both glass and plastic, UVB however is the most dangerous. Always choose sunglasses that are labeled as blocking 99-100% of UV rays. Some manufacturers labels say UV absorption up to 400nm. This is the same thing as 100% UV absorption. Polycarbonate lenses is a wise choice as 100% UV block and protect the eyes against impact injuries that may be sustained during play and sports.
Quality concerns
Different sunglasses material offer differentl quality level.
1.Glass lens are much light weight and offer better eye vision
2.plastic and polycarbonate lens are durable and shatter proof.
3.Nylon or composite frames for durability. Wire-core temples for snug and form-fitting adjustability.
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