Common sense of the use of sunglasses
Date:2022.09.17 Views:564
1) Normally, 8-40% of the light can penetrate through sunglasses. Most people choose 15-25% of sunglasses. Outdoors, most color-changing glasses are in this range, but the light penetration of glasses varies from manufacturer to manufacturer. Darker color-changing glasses can transmit between 12% (outdoors) and 75% (indoors). Brands with lighter colors can penetrate 35% (outdoors) to 85% (indoors). To find glasses with the right depth of color and shade, users should try several brands.
2) Although color-changing glasses are suitable for daily use, they are not suitable for sports in glare environments, such as boating or skiing. Sunglasses shade and color depth are not a measure of UV protection. UV-absorbing chemicals are added to glass, plastic, or polycarbonate lenses. They are usually colorless, and even clear lenses are treated to block UV light.
3) The chromaticity and shading of the lenses vary. Sunglasses with light to moderate shade are suitable for everyday wear. In bright light conditions or outdoor sports, it is advisable to choose sunglasses with strong shading.
4) The shading degree of the gradient dichroic lens decreases sequentially from the top to the bottom or from the top to the middle. It protects the eyes from glare when looking at the sky, while still seeing clearly what is below. Dual gradient lenses are dark at the top and bottom and light in the middle. They effectively reflect glare from water or snow, and we recommend not using them while driving, as they can blur the dashboard.
5) Prescription sunglasses can be tailored according to their needs. In addition to adding UV-absorbing chemicals, sunglass lenses can be manufactured with dyed materials. In addition to dyed materials, producers have developed chemicals that filter light, absorb
specific part of the spectrum. They used a combination of dyeing and filtering substances to develop sunglasses dyes for specific sports, such as golf.
6) Tinted lenses have different light filtering functions. Most tinted lenses can block 70-90% of the light. Some tinted lenses can only filter certain wavelengths of visible light, but not others. Therefore, different dyes may deepen or change the color, affecting the contrast ratio. Some colors, such as pink, blue or purple, are purely decorative and are extremely poor at filtering light. The best way to choose tinted lenses is to hold your sunglasses with your arms outstretched and judge the color against a white background.
