Sunglasses lens types are roughly divided into: anti-reflective protective lenses, color lenses, painting lenses, polarizing lenses and color lenses, such as five.
1. Anti-reflective protective lenses: This lens is coated with a thin layer of magnesium fluoride to prevent strong light reflection, so that you can see things clearer and not by strong light interference.
To detect whether your sunglasses are really using reflective protective lenses, you can align your glasses to the light source, and if you see a purple or green reflection, it means that the lens does have a protective coating on it.
2. Color lenses: Also known as "stained lenses", that is, in the lens production process, coupled with a number of chemical substances, so that the lens rendering color, to absorb a specific wavelength of light. This is the most commonly used lens type for sunglasses.
3. Painting lenses: This lens rendering effect and color lenses are the same, only made in different ways, it is the color coating on the surface of the lens, the most well-known is the "gradient painting lenses", the color is the most deep, and then down gradually shallow.
Generally have the degree of the sunglasses are mostly in the painting way to deal with lenses.
4. Polarizing lenses: In order to filter the sun shines on the water, land or snow on the equal direction of the glare of light, the lens to add a vertical special paint, called polarized lenses. Ideal for outdoor sports (e.g., offshore activities, skiing or fishing).
5. Discoloration lenses: Also known as "photosensitive lenses." Because in the lens to add silver halide chemicals, so that the original transparent colorless lenses, with strong light irradiation, will become tinted lenses, to do protection, so is suitable for indoor and outdoor use.