In the previous article, we discussed “What face shape is best for round sunglasses?”. In this article, let’s talk about “Are blue sunglasses bad for your eyes?”.
Are blue sunglasses good?
Sunlight includes infrared, ultraviolet, and visible light. The light that can be seen by the human eye is visible light, with a wavelength between 400 and 700 nm. Among them, blue light has a wavelength between 400 and 500 nm. Blue light is a high-energy light that generates free radicals, which is easy to cause damage to the eyes.
Although blue and purple sunglasses can block other colors of light, they cannot block this high-energy blue light. In addition, after wearing sunglasses, the light will dim and the pupils will be dilated. The harmful blue light is more likely to shine into the eyes, which may lead to eye diseases such as cataracts and macular degeneration over time.(https://www.koalaeye.com/collections/prescription-sunglasses)
Which are the best sunglasses? Wearing sunglasses in summer is not only to wear clothes and highlight your personal style, but also to protect your eyes from wind, dust, and sun. So, how do sunglasses protect the eyes?
Lens color
Gray, brown, and dark green lenses provide the best protection for the glasses. The Federal Aviation Administration (FAA) recommends gray lenses to pilots. Because this kind of lens is the least likely to distort the colors, and the colors are seen are the most real. However, some pilots believe that dark green and brown lenses are the clearest and have the least blue light.
Troy Bedinghaus, chairman of the Manasota Optometry Society and an optometrist, wrote that orange lenses are suitable for wearing when the light is dark and the weather is foggy. They can increase the contrast, but also cannot distort the colors. Red and rose lenses can block blue light, increase contrast, reduce eye fatigue, and wear them for a long time will not make eyes get tired. However, black lenses are not within the recommended range, because too dark lenses can easily cover the colors. And the objects are not clear enough after wearing them, which may cause danger.
UV index
Ultraviolet rays can harm the eyes, and long-term exposure can increase the risk of cataracts and retinal damage. Therefore, you need to wear glasses for protection. Many people have a misunderstanding that the darker the sunglasses, the better the UV protection effect. In fact, the shade of the lens has nothing to do with the ability of anti-ultraviolet rays. The lens needs special anti-ultraviolet treatment to effectively protect the eyes. Sunglasses need to choose 'UV400', which can filter ultraviolet rays below 400nm.
When buying glasses, you should pay attention to checking the lenses. It is necessary to check whether the surface of the lens is uniform and smooth. If the lens is warped, uneven, or has air bubbles, it is easy to cause dizziness and discomfort.
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