For example, if a child is nearsighted, is it because they have been wearing nearsighted children's eyeglasses all along? Or should I only wear it when needed (such as during class) and not wear it normally?

The supporters of long-term wearing believe that children are young and have an unstable vision. If they remove it, it will aggravate their eye fatigue and easily cause the degree to rise too quickly.

The side that supports wearing glasses when needed believes that once nearsighted glasses are worn, they cannot be removed and will cause the child's myopia to worsen.

These two statements cannot be simply judged, but need to be distinguished based on the actual situation. At this point, we need to customize a pair of myopia lenses. When wearing nearsighted children's eyeglasses, when looking at a distance, light rays refracted by a concave lens will be focused onto the retina, and the field of view will become clearer. However, when looking up close, a problem arises as light rays refracted will be focused onto the retina.

At this point, to adapt to this change, the eyes will adjust the shape of the crystalline lens or elongate the axis of the eye, allowing light to refocus on the retina. If you wear childrens eyeglasses for a long time to see up close, after some time, the continuous adjustment of the lens or axial shape will gradually "fix" this change, indicating a further increase in myopia.

At this point, there is no problem with looking up close, but when looking up far, the light rays are once again focused in front of the retina, and can only be paired with a pair of nearsighted glasses with a deeper degree. As a result, the cycle continues, and the degree of myopia becomes deeper and deeper.