How Long Is The Service Life of A Pair of Glasses?
The use time of a pair of glasses is related to our daily life, work, eye use and maintenance. Generally, the normal use time is about 2 years. Glasses are composed of frame and lens. The raw material of the lens is resin. The lens itself has only diopter and does not have the function of protection. The lenses sold to consumers can be used only after adding various films, but the films are not resistant to high temperature and scratch, It is also necessary to help the eyes to prevent sunscreen. Due to external factors, the lens will have film cracking, lens scratch, yellowing, color deposition, etc. the film cracking will directly affect the line of sight. In serious cases, it will affect the vision and deepen the degree, Lens scratch is also the most common lens problem, especially after the optical center of the lens is scratched, it has a direct impact on the diopter of the lens.
The second part is the mirror frame, which is usually made of metal and injection molding materials. The most fatal problem of the metal mirror frame is the fear of pressure. Once the frame is pressed to deformation, it can not be recovered, resulting in unbalanced wearing. In addition, there will be problems such as surface discoloration, matching lens off welding, falling off, corrosion and fracture by sweat. Generally, the metal mirror frame in normal use will have slight discoloration in one year, The emergence cycle of special workers will be shorter.
Injection molding frame is not friendly to temperature. It is not resistant to high temperature and low temperature. It is easy to deform at high temperature and harden and break at low temperature. Although the color of plate frame will not fade due to sweat, TR90 frame with slightly poor process will also fade, and its fading is large, which greatly affects the beauty.
To sum up, what problems appear in the glasses is the alarm that should be changed
1.Lenses: for more than 2 years, the clarity of the lenses has been reduced. The surface of the lenses has been shedding or cracking. The optical center of the lens is seriously worn and the lenses are yellowish.
2.Frame: the frame is severely deformed and cannot be recovered, the accessories are broken, the frame is seriously discolored (especially at the position contacting the skin), and the frame is hardened and cracked.
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Mike Optical
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