The color-changing mirror is a photochromic lens, abbreviated as "reversible color change caused by light". The material of the lens has evolved from thick and heavy glass to light and thin polymer resin, and the substances that play a color-changing role have also evolved from inorganic "silver salts" (silver halides, etc.) to organic photochromic molecules (color-changing dyes).

Color-changing lenses can be used as ordinary optical discount prescription glasses indoors and also as sunglasses outdoors, thus obtaining broad development space on the eyeglass mart.

So how are color-changing mirrors produced? According to the different methods of adding organic color-changing materials to the lens substrate.

The characteristic of basic transformation technology is to evenly mix color-changing dyes with lens raw materials (monomers), and through casting molding, the monomers are cured to obtain formed lenses with color-changing ability. The production technology difficulty is relatively low.

Due to the varying thickness from the center to the edge of lenses with varying degrees, if the lens manufacturer's process optimization is poor, there may be a Bull eye phenomenon when wearing sunglass near me, which is manifested as the dark color in the thick area of the lens and the light color in the thin area.

Membrane transformation technology usually involves coating a color-changing layer containing color-changing dyes and cross-linked resins on the substrate of formed lenses. Membrane transformation technology is relatively complex, but it can be applied to various refractive index lenses with excellent performance. It is currently the mainstream product in the high-end sunglasses market.