The screen protection film is pressed under high temperature environment, when it encounters a sudden low temperature, it will lead to uneven local light transmission, resulting in rainbow effect. UV coating on sunglasses and eyewear shields your eyes from damaging UV rays. Without wearing UV-protective sunglasses or eyeglasses, even brief exposure to ultraviolet radiation can harm your eyes in ways comparable to a sunburn. Your eyes may turn red and puffy or feel gritty as if you have sand in them.