A human instinct of self preservation, eyes met the light, the pupil will naturally become smaller, making the eyes into the ultraviolet energy reduction, once wore no UV protection sunglasses for UK women and dilated pupils, plus the glasses without ultraviolet isolating effect, when the eyes to open, let the rays into. Damage to the eyes as can be imagined.
The sunglasses can prevent the ultraviolet ray, because the lenses add a layer of special coating, which not only UV blocking sunglasses with best sales and also let the lens transmittance decline seriously.It make the pupil change, but a lot of ultraviolet light into your eye damage. In addition, inferior lens also make people appear disgusting, forgetful, insomnia and other visual fatigue symptoms.
The lens color of cheap sunglasses with a light gray, brown or smoke color for the best, followed by green, amber, blue, red only used as sunbathing or snow.