On a bright, sunny day, many people grab their sunglasses without considering the science behind them. When buying a new pair of shades, most focus on how stylish they look rather than how much protection they provide.
Sunglasses come in all shapes and sizes. They can be purchased at a fancy optical boutique or at a flea market. As long as they are 100% UV-compliant they are safe to wear.
Sunglasses work by blocking certain frequencies of light. It's essential to understand that darker lenses do not always provide the best protection. Lenses can be clear or lightly tinted and still offer complete UV protection. In some cases, darker lenses may be counterproductive. If they do not block 100% of both types of ultraviolet radiation (UVA and UVB rays), the dark tint can cause your pupils to dilate, which allows more UV radiation to enter your eyes.
Ultraviolet (UV) radiation is a type of electromagnetic radiation. The wavelengths are shorter than visible light (to the human eye), but longer wavelengths than those of X-rays. While electromagnetic radiation surrounds us, we can only see a small part of it. This type of radiation consists of tiny packets of energy known as photons. The primary source of UV radiation is sunlight.
During the manufacturing process, lenses are treated with a special coating that has chemicals designed to absorb and filter out harmful UV rays. By blocking these rays from reaching your eyes, UV-protective sunglasses help reduce the risk of eye damage and contribute to maintaining healthy vision. When selecting sunglasses, choose a pair that provides 100% UV protection to effectively block harmful rays. The frame should fit snugly without pinching your ears or nose, and its weight should be evenly distributed. Additionally, your eyelashes should not come into contact with the lenses. Wraparound sunglasses or those with a wrapped profile offer the best UV protection due to their wider coverage.
Sources:
www.science.howstuffworks.com
www.fda.gov
www.mcgil.ca
www.webmd.com
www.REI.com
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