How long does a pair of glasses last？？？？
Today to share how long a pair of glasses can be used, there are many friends around are wearing glasses, some people are following the trend and good looking style on the new, there are a lot of parts are only until the frame is completely broken, can not wear the new, more exaggerated casual repair can also wear. But in fact, glasses also have a lifespan.
The use time of a pair of glasses is related to our daily life, work, eye use degree and maintenance degree. Generally, the normal use time is about 2 years. Glasses are composed of frame and lens. The raw material of the lens is resin, and the lens itself only has diopter, but not protective function. However, the film is not resistant to high temperature, not resistant to scratches, but also to help the eyes sun protection, the lens will be due to external factors, film cracks, lens scratches, yellow, color deposition, etc., film cracks directly affect the line of sight serious will affect the eyesight caused by deepening. Lens scratches are also the most common lens problem, especially after the lens optical center scratches have a direct effect on the lens diopter.
The second part is the frame, the frame material is generally metal and injection molding materials are common, the most deadly problem of the metal frame is the fear of pressure, but the frame is pressed to the deformation of the basic can not be restored, wearing imbalance, in addition, there will be surface fading and mirror welding, falling off, corroded by sweat and other problems. Normal use of metal frames generally 1 year will appear slightly faded phenomenon, special workers appear cycle will be shorter.
Injection molding frames are not friendly to temperature, not resistant to high temperature and low temperature, high temperature is easy to deformation, low temperature is easy to harden and break, although the color of the plate frame will not fade because of the problem of sweat, but the TR90 frame with a slightly poor process will also fade, and his fading is a large area, very affecting the appearance.
To sum up, what is the problem with the glasses is the alarm that should be changed
Lens: After using the lens for more than 2 years, it is obvious that the clarity is decreased, the lens surface film is shed or cracked, the optical center of the lens is seriously worn, and the lens is yellowish color precipitate.
Frame: the frame is seriously deformed and cannot be recovered, the accessories are broken, the frame is seriously discolored (especially in the position of contact with the skin), and the frame is hardened and cracked.
