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What is the difference between UVA and UVB rays?

The difference between UVA and UVB rays is the wavelength. UVB rays are shorter than UVA rays, so they don't penetrate the ozone layer as easily. From a health standpoint, the important thing to remember is that too much exposure to both UVA and UVB rays can affect your skin (early aging, cancer) and the lenses of your eyes (cataracts).
Amy K. Kim, MD
Dermatology
UVB is the one that causes the acute sunburns. The UVA rays can also cause sunburns a little bit later, and also causes wrinkle formation and the aging process to start happening.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.