What type of sunglasses lens blocks the most light?

Sunglasses with polarized lenses are designed to block glare from surfaces like water or roads, enhancing visual clarity. However, if you are looking for lenses that block the most light, those with a category 4 rating are the most effective, blocking up to 97% of visible light. These are typically recommended for extreme conditions, such as high-altitude or snow environments, where intense sunlight exposure occurs.