About Sun Lens Level
Sunglass lens transmittance classification 1, 2, 3 and 4 represents the different levels of transmittance, which is the degree of light transmission.
The lower the transmission ratio, the lower the degree of light transmission, making it harder to see clearly.
Therefore, Class 4 sunglasses cannot be used for driving.
1. 43%~80% are a type of light colored sunglasses;
2. 18%~43% are Class II sun visors;
3. 8%~18% are classified as three types of sun visors;
4. 3% to 8% are special purpose sunglasses (for skiing, hiking, beach, etc.).
For light colored sunglasses, their light transmittance should be>40%.
For sunshades, the range of light transmittance is 8% to 40%.
The light transmittance is an important indicator of the function of sunglasses. The current Chinese standards classify sunglasses into three categories based on this function: sunshades, light colored sunglasses, and special purpose sunglasses, while European and international standards classify them into five categories.
Additional information: Polarized sunglasses, due to their polarizing properties, can completely block glare caused by various factors such as scattering, refraction, and reflection. It can completely block harmful ultraviolet light from the human eye, making the eyes less prone to fatigue during long-term activities under strong light, achieving the function of truly protecting the eyes, and making what is seen clearer and more three-dimensional.
This is also why many drivers find wearing polarized lenses to be the most comfortable for their eyes.
The significance of these levels is to guide people on how to choose suitable sunglasses to protect their eyes from UV damage. Generally speaking, when purchasing sunglasses, consumers should choose the appropriate UV protection level according to their needs and usage scenarios, and pay attention to choosing legitimate brands and manufacturers to ensure that the protective performance of sunglasses meets the standards.
Thanks for reading.
Sophie Yang
004@mikeeyewear.com
