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Visible light is generally considered to be safe and does not directly cause skin cancer. Unlike UV radiation, visible light has lower energy and does not have enough energy to break chemical bonds or directly damage DNA in cells.
However, visible light can contribute to the development of skin cancer indirectly. Specifically, visible light can activate certain compounds in the skin, such as porphyrins, which can generate reactive oxygen species (ROS) through a process known as photodynamic action. ROS can damage cellular structures, including DNA, and over time, this damage can accumulate and lead to mutations in the DNA that can contribute to the development of skin cancer.
當然
It's important to note that the contribution of visible light to the development of skin cancer is generally considered to be much lower than that of UV radiation.