Catogray Of Sun Lens
Sunglasses lens transmittance classification 1，2，3，4 represents the different levels of this transmittance, that is, the degree of light transmission.
The lower the transmission ratio, the lower the transmission degree of light, the more difficult it is to see, so category 4 sunglasses can not be used for driving.
1, 43%~80% for a class of light sunglasses;
2, 18%~43% of the second type of sunshade mirror;
3, 8%~18% for three types of sunshade mirror;
4, 3% to 8% for special purpose sunglasses (skiing, climbing, beach, etc.).
For light-colored sunglasses, the light transmission ratio should be >40%; For the sunshade mirror, the light transmission ratio ranges from 8% to 40%.
The optical transmittance item is an important index to characterize the function of sunglasses. The current Chinese standard divides sunglasses into three categories according to this function: shading glasses, light sunglasses and special purpose sunglasses, while the European standard and international standard divide them into five categories.
Extended data: Polarized sunglasses due to the nature of polarization, so it can completely block the dazzling glare caused by various factors such as scattering, flexion, reflection. It can completely block the ultraviolet light harmful to the human eye, so that when people are active under strong light for a long time, the eyes are not easy to tire, and the function of truly protecting the eyes can be achieved, and the things can be seen more clearly and three-dimensional. That's why many drivers feel most comfortable with polarizing eyes.
Thanks for reading
Sophie Yang
004@mikeeyewear.com
