The safest bet is to buy sunglasses that provide 100% UV protection, or UV 400 protection. That means that the glasses protect your eyes from both UVA and UVB radiation. Most expensive sunglasses offer this level of protection on all models.
Hereof, what are Category 3 sunglasses?
Fashion spectacles with category 1 lenses are not suitable for driving at night. These sunglasses provide a medium level of sun glare reduction and good UV protection. Similar to category 2, these sunglasses provide a good level of UV protection. Lens category 3 glasses also provide a high level of sun glare reduction.
What is the highest UV rating for sunglasses?
Look for sunglasses that protect you from 99 to 100 percent of both UVA and UVB light. This includes those labeled as "UV 400," which blocks all light rays with wavelengths up to 400 nanometers. (This covers all of UVA and UVB rays.)
What is visible light transmission percentage?
Visible light transmission is calculated on the percentage of light that's visible through a tinted glass. The lower the VLT, the darker the tint, and ultimately the more light that will get blocked. If you have a window with a VLT of 50 percent, it lets in 50 percent of exterior light.