Whether children's sunglasses need to be polarized or not depends on the actual situation. Polarizers are functional

How to properly clean eyeglass lenses: 1. It is recommended that when you do not wear glasses,

PD is the distance between the two optical centers of the lens, which is critical to the

1. When wearing progressive multi-focal glasses at the initial stage, the principle to be followed is: first

Generally speaking, sunglasses can also be equipped with glasses, provided that they are flat, without the influence

Most people now use special resin lenses. One thing about resin lenses is that the lenses are