In fact, many people have no idea about the lifespan of frame glasses. The glasses are not broken and the power is sufficient. Many people wear a pair of oxidized yellow glasses for many years, so their eyes are always tired.
Why change glasses?
After long-term use, the lens will oxidize and turn yellow, and the clarity and light transmittance will be reduced.
Coupled with the poor wear resistance of some lenses, there will be different degrees of wear and scratches, which will cause eye fatigue, and in severe cases may also make myopia worse.
So there are 4 purposes for changing glasses:
First, the surface of optical lenses will be worn to a certain extent during use; resin lenses can absorb ultraviolet rays, but at the same time the lenses will also age and yellow. These factors will affect the light transmittance.
Second, with the change of age, the environment and degree of use of the eye, the refractive state of the human eye has been changing, so adults have to refraction every year to one and a half years.
Third, in order to provide maximum comfort, the new frames are made of bionic materials to make accessories, but the accessories will also age as a result, just like changing the tires of a car regularly.
Fourth, the lens angle must be kept at the same angle as the line of sight, otherwise the target will not be seen clearly, and this angle will change as the glasses are repeatedly removed and worn, so regular adjustments are very important.
How often should the glasses be replaced?
Many people think that their eyesight has been finalized. As long as the myopia is not bad, it is no problem to wear a pair of glasses for a few years. Even some elderly people “wear a pair of glasses for decades”. This approach is incorrect.
Both myopia and reading glasses need to be checked regularly and replaced in time.
How often should children change their glasses?
Children and adolescents need to be reviewed every 3 months or half a year. If the glasses are no longer suitable for children, they should be replaced in time.
Adults: usually change every one and a half to two years
Due to the relative stability of the degree, adults’ refraction frequency and initiative are far inferior to those of children and adolescents. Even some adults are too lazy to do optometry and just use the original spectacles’ degree to directly prepare glasses. These are incorrect practices.
Medical optometry is also required for adult glasses. Adults should generally change their glasses every one and a half to two years.
The reading glasses of the elderly should also be replaced regularly
Out of frugality, many elderly people wear reading glasses for several years or even ten years.
There is no uniform time rule for the replacement of reading glasses. When the elderly wear glasses and read the newspaper and feel tired and the eyes are sore and uncomfortable, they should be replaced.
How to extend the life of glasses
Glasses should be cleaned frequently and carefully taken care of, so as to extend the life of the glasses, but even simple cleaning of the glasses, there are methods.