How long can a pair of glasses last
Today I am going to share how long a pair of glasses can last. There are many friends around who wear glasses, and some people just follow the trend and look good and replace them with new ones. There are many parts that only wait until the frame is completely broken and can’t be worn. It will be replaced with a new one, and it is even more exaggerated that you can still wear it if you repair it casually. 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, and maintenance. Generally, the normal use time is about 2 years. The glasses are composed of frames and lenses. The raw material of the lenses is resin, which itself Lenses only have diopter and do not have the function of protection. The lenses sold to consumers can only be used after adding various coatings, but the coatings are not resistant to high temperature and scratches. Due to external factors, film cracks, lens scratches, yellowing, color deposition, etc., film cracks directly affect the vision seriously, which will affect the vision and cause the degree to deepen. Lens scratches are also the most common lens problems, especially if the optical center of the lens is scratched, it directly affects the diopter of the lens.
The second part is the frame. The material of the frame is generally made of metal and injection-molded materials. The most fatal problem of the metal frame is that it is afraid of pressure. Once the frame is pressed and deformed, it cannot be recovered. There will be problems such as surface fading and glasses desoldering, falling off, and being corroded and broken by sweat. Normally, metal frames in normal use will have a slight color fading phenomenon in one year, and the cycle of special workers will be shorter.
The injection-molded frame is very unfriendly to temperature, not resistant to high temperature or low temperature, easy to deform at high temperature, and easy to harden and break at low temperature. Although the color of the sheet metal frame will not fade due to the problem of sweat, the TR90 frame with slightly poor craftsmanship is also There will be color fading, and his color fading is even larger, which greatly affects the appearance.
To sum up, what problems with glasses are the alarms that should be replaced
Lens: The lens has been used for more than 2 years, and it is obvious that the sharpness has decreased, the film on the lens surface has fallen off or has cracks, the optical center of the lens has been severely worn, and the lens has yellow-like color deposits.
Frame: The frame is severely deformed and cannot be recovered, the accessories are broken, the frame is severely discolored (especially the position where it touches the skin), and the frame is hardened and cracked.
