Ultraviolet light Medical Assignment Help

Ultraviolet (UV) light consists of UVB (wavelength 290-320 nm) and UV A (320-400 nm). Wavelengths 100- 290 nm are stopped by the ozone layer.
• UVB causes sunburn.
• UV A and UVB cause skin ageing and skin cancer. Sunscreens absorb UV energy but many preparations only absorb UVB.
The sun protection factor (SPF) is a guide  on the sunscreen performance, but there is no worldwide standard and often the protective effect is only against UVB. With a normal skin, a water-resistant sunscreen of 8-10 containing p-aminobenzoic acid is recommended to avoid sunburn.

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