Under normal circumstances, sunlight is shot in all directions. When it hits an object, the light is redirected and reflected, forming two kinds of reflected light that vibrate horizontally and perpendicular to the direction of light propagation. The former is the random reflected light that causes dazzling, which affects the line of sight. of useless polarized light.

Polaroid's polarized lenses are special filter lenses that filter out reflections from water, wet or sunlit roads, and wet sand. It is a thin lens made of synthetic resin, which is composed of seven layers of flakes. The outermost two layers are super-hard wear-resistant layers; the second and sixth layers are shatter-resistant reinforcement layers; the third and fifth layers are UV filtration. layer; the middle layer is the polarizing filter layer, the overall structure is precise and unique.