The solar spectrum
The sun is a source of energy that reaches our planet in the form of electromagnetic rays with different wavelengths (λ). Human beings exposed to the sun perceive the effect of this radiation either in the form of visible light (high-energy visible light, HEV) or, in the case of infrared radiation (IR), as heat. UV rays, however, cannot be seen by the naked eye, making sun exposure an invisible risk.
Solar radiation and the skin
The different wavelengths of the rays that reach our bodies penetrate our skin at varying depths and produce differentiated biological effects.
The skin has defence systems against solar radiation, such as melanin production or the release of antioxidant substances. However, it does not have a natural ability to protect itself against all the effects of occasional or cumulative overexposure on the body.