But usually the myopia glasses we wear have a small curvature, that is, the whole is relatively flat and there is a lot of light leakage around. Once the lens darkens, we will see that the reflection of eyes and ears will affect our vision, while sunglasses are curved as a whole, which can fit the curve of our forehead and face, with little light leakage and much better effect.
So if you want the best effect, it is recommended to buy sunglasses frames and customize curved lenses, so that they can be the same as real sunglasses.
Of course, there are other methods, such as double-sleeved glasses, that is, adding a sunglasses lens in front of the glasses, which can be taken off when not in use, but this method also has the problem of reflection, which is more serious than dyed lenses. It is ok to use it in the car or in the shade indoors, but don't use it in the sun.