Teach you to identify the intrinsic quality of the lens experts say, to buy sunglasses, consumers still have to identify the intrinsic quality of the lens. Lenses lenses should meet the requirements of the plain glass lens, and should not affect the vision of the optical flaw. Simple identification method, will be placed in front of sunglasses, observe distant targets through a lens, such as window frames or door frames, etc., and then glasses up and down before and after the move, targets should not sway and wave-shaped deformation. Partial Yan lens color of the surrounding environment should be made without distortion, the edge of the object clearly identified with the effective capacity of different color lights. Lens color depth selection, a place for activities as may be required for different light sources and occasions, the color will affect the lens shading effect. For sunglasses can effectively block the intense summer light, the color of glasses due to sufficient depth, but those who ride or drive, do not choose too dark lenses. Should also be noted that improper susceptible to wear sunglasses eye, cloudy, and there is no need to wear sunglasses indoors. Some people, regardless of occasions, whether strong or weak sunlight, even in the evening, the evening and in the movies, television, also wearing sunglasses, this will inevitably increase the burden of adjusting the eye, causing eye muscle tension and fatigue, vision loss, visual fuzzy objects, in severe cases dizzy, not a long time as other symptoms.
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Tags: Glasses
