In life, there are too many light sources that will produce harmful light, especially sunlight; there are three types of light emitted from sunlight: visible light, infrared light, and ultraviolet light. Among them, ultraviolet rays can cause serious damage to human skin, eyes, etc.; the light released by sunlight is above IR (Infra-red) infrared (750nm) and visible light (310~780nm); Ultraviolet rays are further divided into UVA, UVB, UVC (310nm) and above, and blue light (Blue light), of which UVA, UVB, and UVC are harmful rays. If exposed to the sun for a long time, it will cause damage to the body. UVB has a serious impact on vision, ( Tanning Ray) is the light that burns the skin, most of the corners of the eyes will absorb this kind of UVB light, so be sure to block this kind of light source. Because fishing glasses have the function of polarizing light, they can block all harmful light without affecting the transmission of visible light, which can truly protect the eyes. In addition to the basic anti-ultraviolet function, fishing glasses also have anti-glare, road reflection light, water surface scale, etc., suitable for driving, fishing, tourism, and daily wear.

Fishing glasses block unpleasant glare while protecting your eyes from UV rays. All thanks to metal powder filters that "select" light as it hits it. Fishing glasses can selectively absorb some of the wavelengths that make up the sun's rays because they use very fine metal powders (iron, copper, nickel, etc.). In fact, when light hits the lens, it is eliminated based on a process called "destructive interference". That is, when certain wavelengths of light (in this case ultraviolet a, ultraviolet b, and sometimes infrared) pass through the lens, they cancel each other out on the inside of the lens, toward the eye. It is no accident that the overlapping waves that make up light waves: the crests of one wave combine with the troughs of adjacent waves, causing them to cancel each other out. The phenomenon of destructive interference depends on the index of refraction of the lens (that is, the degree to which light rays deviate from the air as they pass through different substances), and also on the thickness of the lens. In general, the thickness of the lens does not vary much, and the refractive index of the lens varies according to the difference in chemical composition.