If the glasses are not worn out, don't you need to change them? Don't think this is a way to change your glasses faster. The vast majority of people are unaware that lenses have a lifespan, which refers not to the physical integrity of the lens, but to eyeglasses online cheap optical lifespan.

Do you no longer need to undergo optometry every time your vision is fixed? Many people would say that my prescription hasn't increased in a long time and has been stable. I can skip the optometry and just get glasses, which saves time. I think there is no such thing as fixed vision because a person's refractive parameters cannot remain unchanged throughout their lifetime, they change every year.

For example, both eyes have 100 degrees of astigmatism, and I insist on changing my eyeglasses every year. I found that the direction and axis of astigmatism fluctuate and change every year.

If the lens is matched according to the parameters of the previous year, it obviously cannot achieve the best light performance of the lens. And everyone doesn't know that the degree of fitting varies depending on the environment in which the eyes are used. The distance between each frame and the eyes is different, so the required eyeglasses online cheap degree is also different.

For example, if you choose a full-frame face mount frame, you may need to reduce it by 25 degrees, and if you choose a frame with high nose support, your degree will need to increase by 25 degrees to achieve optimal vision.

So, next time everyone goes to change their eyeglasses online cheaply, even if the prescription hasn't changed much, they must re-check the prescription or make minor changes. Don't think it's a waste of time.