Proposal to buy Sunglasses(2)

1) the anti-ultraviolet function of identity: a pair of sunglasses have anti-ultraviolet function, we can not distinguish with the naked eye, the factory products express promise is for consumers to buy the protective sunglasses only reference, we can in some product labels and glasses to see the front such as: "100% UV", "UV400", "blocking all UV", "ultraviolet" express logo. UV is the wavelength in 200nm ~ 400nm between the rays of the sun, including three categories: UVA wavelength is 315nm ~ 400nm, UVB wavelength is 280nm ~ 315nm, 200nm ~ 280nm wavelength is UVC. To reach the earth's surface of the sun's rays (290nm ~ 2000Nm) in the UV accounts for about 13%, which accounted for 97% of UVA, UVB 3%, UVC close to 0. UV damage to human mainly depends on the wavelength of ultraviolet light, radiation time and radiation intensity and the human own defense mechanism, strong or weak, coea, lens is the most common eye tissues from damage by ultraviolet radiation, solar dermatitis and coeal endothermic damage, daylight cataract is the most relevant with the eye disease. In order to protect the health of the eye, can choose with anti-ultraviolet function of lens made of Cheap Ray Ban Sunglasses; try to eliminate the UV below 400nm.

(2) The relevant safety performance indicator: has the safety performance of sunglasses, produce such as PC, CAT lens impact material using the lens, in the labels and instructions are often labeled "impact performance" and so on, if the product can reach label requirements, motorcyclists, drivers and other special requirements for the safety of consumers is a good choice. On the product label on the commitment, consumers should lea to protect themselves, the label or instructions or save, or let a businessman in the invoice, once a dispute, will not be a lack of evidence and passive.

3 must have the inherent quality to identify Ray Ban Sunglasses lens of basic skills to choose good Sunglasses brand products

(1) The degree of lens should meet the requirements for plain lenses, and should not affect the optical sight defects. Simple identification methods, can be placed in front of sunglasses, through the lens observe distant targets, such as a window or door frame, then glasses up and down before and after the move, the target should not sway and wave-shaped deformation.

(2) The color of the lens is not partial, should be so that the distortion of the color of the surrounding environment, the object edge is clear with effective identification of different color signal light. The choice of lens color depth, due as the required activities, according to the different light source and occasions, will affect the color of the lens shading effect. To make the summer of sunglasses can effectively block the light, the colors for glasses have enough depth, but those who ride or drive, do not choose Cheap Ray Bans lens color is too deep.