Sunlight consists of radiation with differing wavelenght: infrared (IR), visible (VIS), and ultraviolet (UV) radiation. Concerning skin damages and sun protection, the UV-radiation is important. UV-radiation that reaches the earth consists of short wavelenght UVC (< 280 nm), intermediate wavelength UVB (280- 320 nm) and long wavelength UVA (320-400 nm). Under physiological conditions, human cells are exclusively exposed to UVB and UVA radiation, because the ozone layer in the stratosphere completely absorbs wavelengths < 290 nm. The amount of UVA radiation reaching the earth's surface is approximately 20 times greater than that of UVB radiation. Sun exposure induces acute and chronic effects on the skin depending on the wavelength of radiation. UVB are mostly absorbed by the epidermis while UVA penetrate more significantly in the dermis. Acute UVB deleterious effects are sunburn and related inflammation. Acute UVA exposure is mainly responsible for photoallergic and phototoxic reactions. Chronic effects of UVB and UVA exposure include photoaging, immunosupression and photocarcinogenesis. Apart from the skin, the organ most susceptible to sunlight induced damage is the eye. Scientific evidence accumulates to indicate that acute exposure to artificial light or chronic exposures to sunlight either causes or exacerbates age-related ocular diseases. The adequate sunglasses provide protection against ocular effects from sunlight exposure. The regular and adequate use of sunscreenes, avoiding the sun around mid-day, staying in the shade, wearing hats with brims which can shade the head, face and neck, and wearing clothes made from tightly woven fabrics, are ali important factors that could prevent the deleterious effects of sunlight. The mismatch between the expected protection achieved by sunscreens and that observed in practice depends upon a number of factors .