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  2. These Stylish, Doctor-Approved Reading Glasses Can Help ... - AOL

    www.aol.com/best-doctor-approved-reading-glasses...

    These blue-light-blocking readers from Peepers—a brand that Oprah previously touted in her annual Favorite Things list—refuse to blend into the background, but they aren’t too loud to wear ...

  3. Optical mark recognition - Wikipedia

    en.wikipedia.org/wiki/Optical_mark_recognition

    The first optical answer sheets were read by shining a light through the sheet and measuring how much of the light was blocked using phototubes on the opposite side. [11] As some phototubes are mostly sensitive to the blue end of the visible spectrum , [ 12 ] blue pens could not be used, as blue inks reflect and transmit blue light.

  4. Sunglasses - Wikipedia

    en.wikipedia.org/wiki/Sunglasses

    Lenses of various colors can offer sufficient (or insufficient) UV protection. Regarding blue light, the color gives at least a first indication: Blue blocking lenses are commonly yellow or brown, whereas blue or gray lenses cannot offer the necessary blue light protection. However, not every yellow or brown lens blocks sufficient blue light.

  5. Comparison of e-readers - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_e-readers

    An e-reader, also known as an e-book reader, is a portable electronic device that is designed primarily for the purpose of reading e-books and periodicals.E-readers have a similar form factor to a tablet; usually use electronic paper resulting in better screen readability, especially in bright sunlight; and have longer battery life when compared to a tablet.

  6. 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.

  7. Comparison of Usenet newsreaders - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_Usenet...

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