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2. Wait, So Do Blue Light Glasses Actually Work? Here's What ...

   www.aol.com/wait-blue-light-glasses-actually...

   See explains. "As we get older, our lenses are less flexible. This is why people in their 40s start needing reading glasses. Some blue-light glasses also include a plus lens to help bring your ...

3. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Sunglasses allow for better vision in bright daylight and are used to protect one's eyes against damage from excessive levels of ultraviolet light. Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into ...

4. Biological effects of high-energy visible light - Wikipedia

   en.wikipedia.org/wiki/Biological_effects_of_high...

   Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.

5. Photochromic lens - Wikipedia

   en.wikipedia.org/wiki/Photochromic_lens

   A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate, or another plastic. Glass lenses use visible light to darken.

6. Anti-reflective coating - Wikipedia

   en.wikipedia.org/wiki/Anti-reflective_coating

   For the simplified scenario of visible light travelling from air (n 0 ≈ 1.0) into common glass (n S ≈ 1.5), the value of R is 0.04, or 4%, on a single reflection. So at most 96% of the light (T = 1 − R = 0.96) actually enters the glass, and the rest is reflected from the surface. The amount of light reflected is known as the reflection loss.

7. Airlines seen making $1 trillion for the first time in history

   www.aol.com/airlines-seen-making-1-trillion...

   The global airline industry will likely rake in more than $1 trillion in revenue next year, as passenger numbers look set to hit an all-time high of 5 billion, the International Air Transport ...