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Recently, a friend of mine felt his eye prescription had gone up and was planning to get a new pair of glasses. I casually asked, "How long has it been since you've changed the glasses?" My friend said indifferently: "Three or four years, I can still see clearly all the time, and I don't think about changing. " "What? You do not know that glasses have a shelf life!" "Glasses have a shelf life? How long?" We were both shocked.

So I asked some people around me; surprisingly, eighty percent did not know, then I had to talk about it!

What is it like to have glasses that have passed their "shelf life"?

01 As if the video site VIP did not renew

First of all, the lenses will inevitably wear in the process of daily use. Most of the glasses lenses on the market are resin lenses. Long-term use or improper maintenance will inevitably produce wear and scratches, affecting the imaging effect and clarity, thus causing eye fatigue and seriously accelerating the development of nearsightedness.

In layman's terms, you just got new glasses, as if the video site opened a VIP membership, video clarity can be adjusted to 1080p or even 4k. But after the glasses produce wear and tear, you can only watch 480p video, is not to think about it is pretty uncomfortable!

02 The world seems to add a dark yellow filter

Secondly, long-time lens use will produce oxidation yellowing, and light transmission and clarity will also decline. Eyes will be fatigued wearing yellowing lenses due to oxidation, which is the "help me!" signal it sends to you. So, if you last changed your lenses a long time ago, check if your lenses show signs of darkening and yellowing when you use them. Note: anti-blue light lenses themselves will show a particular yellowish color, which is normal.

03 Teenagers' eye prescriptions rise fast

Some teenagers have been wearing glasses for more than one year or even two years. During this period, their bare-eye vision has increased slightly, but they are afraid to inform their parents for fear of being blamed or being asked by their parents not to use electronic devices. In addition, parents also need to gain some knowledge of eye use, and have not been timely reviewed. Only when they wore glasses and couldn't see very well did they ask their parents to change their glasses, but after the checkup, they found that their vision had increased dramatically.

How often is it reasonable to change eyeglasses?

A. Regular review and timely replacement according to changes in eye prescription

Teenagers are in the stage of growth and development. Especially for secondary school students, the heavy study load leads to high intensity of eye use. Therefore, it is recommended to review at least once every six months and replace glasses if necessary. It is also essential to develop good eye habits to slow down the rate of shortsightedness deepening.

For young and adults, the prescription is generally in a more stable state. But it is also recommended that regular annual medical optometry, especially for people who use their eyes intensely and work long hours with electronic products, choose to continue to wear or replace glasses according to the examination results. Note that when some people's glasses are broken directly according to the original glasses prescription, this may cause visual fatigue, thus deepening nearsightedness.

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