As long as the new frame is smaller than the original frame, the lens can be ground down in the optical shop, and the new outline should be enclosed in the outline of the previous frame and cannot overflow.

Polishing a lens means grinding off a large part, and comparing the lens with a new frame, the outline of the lens should completely surround the outline of the frame. The degree will not change.

Extended data:

If you only change the frame without changing the lens, the lens needs polishing. This not only changes the original size and shape of the lens, but also changes the pupil distance and astigmatism axis, which is easy to cause damage to vision.

Many people think that the lenses are still very good when matching glasses, and they have adapted to the original lenses, so they want to replace the original frames. In fact, the shape and size of this replacement frame will be more or less different. After polishing, some original data will be changed, which will further aggravate the degree of myopia.

The lens size after secondary processing will be smaller than the original lens size, which will definitely affect the coordination of wearing. The distance between eyes and the forward angle of glasses will also change greatly, which is likely to affect the comfort of wearing. Generally, the service life of a pair of glasses is about three years. No matter how well preserved, it will slowly oxidize and turn yellow, and the clarity and transparency of glasses will decrease.

At present, most glasses are resin lenses, which have poor wear resistance and are easy to wear for a long time. Wearing unclear glasses for a long time can easily cause eye fatigue and aggravate myopia, so check your eyesight frequently and replace your lenses in time.

Tips: If you must change the frame, you can choose the same frame as the original, otherwise it is best not to change the frame casually.