The eyes are the windows of the soul, and over 80% of natural information is obtained from the eyes. At the same time, the eyes are also very fragile. Excessive summer light not only makes the eyes tired and difficult to open, but also the ultraviolet rays in the sunlight can damage the crystalline and macular structures in the eyes, causing irreversible damage. A pair of high-quality sunglasses can reduce visible light intensity, improve visual quality and color contrast, avoid eye fatigue, and eliminate harmful ultraviolet rays to prevent eye damage. It is the best choice for summer eye sun protection. How to choose sunglasses?
Firstly, it is necessary to understand the characteristics of several commonly used sunglasses lenses:
1. Anti reflective protective lenses: Apply a thin layer of magnesium fluoride on the surface of the lenses to prevent strong light reflection, making the wearer's vision clearer and less affected by strong light interference.
2. Color lenses: During the lens manufacturing process, certain chemicals are added to make the lenses appear colored, in order to absorb specific wavelengths of light. This is the most common type of sunglasses.
3. Colored lenses: They look similar to colored lenses, but only apply color to the surface of the lens. The most well-known type of lens is the progressive colored lens, which has a darker color on top and lighter color on the bottom, and is the most common type of lens for sunglasses with degree.
4. Polarized lenses: In order to eliminate dazzling light from the sun in the horizontal direction, special vertical coatings are added to the lenses, which have anti glare and anti fatigue functions and are suitable for use in sea sports, skiing, or fishing.
5. Color changing lenses: also known as photosensitive lenses, add silver halides to the lenses to make the originally transparent lenses colored when exposed to strong light, providing a certain degree of protection and suitable for both indoor and outdoor use.
Then let's learn more about the purpose of sunglasses:
1. Sunshade: In outdoor activities, especially in summer, people need to adjust their pupil size to adjust the light flux under sunlight, which can cause fatigue over time. Sunshade can block some strong light, reducing eye fatigue caused by eye adjustment and damage caused by strong light stimulation.
2. Light colored sunglasses: They are not as good at blocking sunlight as sunshades, but they are rich in colors, diverse in styles, and have a strong decorative effect. They can be used to match fashion and different hairstyles and makeup.
3. Special purpose sunglasses: They have a strong ability to block sunlight and are commonly used for long-term outdoor activities with strong sunlight. They have high requirements for UV resistance.
Finally, let's focus on the other characteristics of the lenses:
1. Color: Sunglasses lenses should be brown and gray in color. These two colors have better absorption of infrared and ultraviolet rays, which can improve visual contrast and clarity while effectively preventing UV damage to the eyes. At the same time, it is important to pay attention to the appropriate color depth to prevent visual discomfort and safety hazards caused by obstructing the surrounding line of sight due to excessively dark colors. It is also important to prevent colors that are too light from effectively blocking out strong light.
2. Anti UV function: The important function of sunglasses is to prevent UV rays, so sunglasses with the "UV400" logo are truly effective sunglasses that can block more than 90% of UV rays.
