Photochromic are related to sunglasses. The only differences are the specification changes. Expose our CAMO Photochromic Series to sunlight, VLT (Visible Light Transmission), VLR (Visible Light Reflection), IRR (Infra Red Rejection), TSER (Total Solar Energy Rejection), SHGC (Solar Heat Gain Coefficient), and etc are changed. Conversely, photochromic film will get darker in hot weather conditions, which makes them more suitable for automobile and building.