Will the sunglasses expire too?

u003cbru003eDoes sunglasses have a useful life? Will they expire? Many friends will be surprised to hear about it for the first time. How long can a pair of sunglasses be worn? Many people think that as long as the sunglasses are not broken, they can not be replaced for many years. In fact, this idea is wrong. The lens material of sunglasses will age over time, and improper wearing habits can also cause damage to the sunglasses. Wearing damaged sunglasses for a long time can cause damage to eyesight. 9001 golden sunglasses 'expired' sunglasses protection function is degraded. Incorrect wearing and storage habits can damage the sunglasses lens and cause the frame to be deformed. A person who is used to wearing glasses with a 0° tilt of his body and legs, if his new lens is fitted with a 10° tilt of his body and legs, even if the degree and the optical center distance are the same as the original lens, he may experience dizziness after wearing the rearview object, and position up and down Symptoms such as inaccuracy. Because the position of the temples is mostly connected to the upper part of the eyeglass frame, and due to the gravity of the glasses themselves, the optical center of the spectacle lens is generally below the pupil when worn. For glasses with different body and leg inclination, the angle of incidence of the light relative to the lens changes, which causes a shift in the position of the visual object. In this case, the solution is to properly adjust the tilt of the temples to make them close to the original mirror. 'Expired' sunglasses lens wear. With the development of optical technology, more and more high-quality sunglasses that are more beneficial to our eyes are constantly being developed. Therefore, it is necessary to replace the sunglasses in 1-2 years. Most spectacle wearers neglect the cleaning and storage methods of the spectacles and cause the lenses to wear out. At this time, they need to be replaced in advance. Otherwise, the light transmittance of the lenses will decrease and the user's vision will decrease. Worn lenses are prone to chromatic dispersion and other phenomena. Wearing such sunglasses will make people's eyes tired and hurt the eyes. In particular, unqualified sunglasses not only cannot block the penetration of ultraviolet rays, but because the transmittance of colored lenses is severely reduced, the eyes will look like looking at objects in a dark room after wearing them, but they will enlarge the pupils and unblocked ultraviolet rays. Injection into the eyes will damage the eyes. Wearing it for a long time can cause diseases such as solar keratitis, corneal endothelial damage, and macular degeneration of the fundus. For the use of sunglasses, one is to buy sunglasses and choose a professional and regular spectacle shop to maintain the glasses on a regular basis; second, the sunglasses are better to be replaced every 1-2 years. Related Reading: Sunglasses Polarized Sunglasses

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