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Ultraviolet (UV) rays are located just past the violet portion of the visible light spectrum; sunlight is the main source. UV light is broken into three different types: UVC, UVA, and UVB.
1. UVC rays do not reach the Earth because its atmosphere blocks them.
2. UVA has longer wavelengths and passes through glass easily; experts disagree about whether or not UVA damages the eyes.
3. UVB rays are the most dangerous, making sunglasses and sunscreen a must; they don't go through glass.
That is to say UVB is very harmful to our eyeglasses, we should buy and wear sunglasses to prevent Ultraviolet (UV) rays.
1. UVC rays do not reach the Earth because its atmosphere blocks them.
2. UVA has longer wavelengths and passes through glass easily; experts disagree about whether or not UVA damages the eyes.
3. UVB rays are the most dangerous, making sunglasses and sunscreen a must; they don't go through glass.
That is to say UVB is very harmful to our eyeglasses, we should buy and wear sunglasses to prevent Ultraviolet (UV) rays.