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  2. Glass code - Wikipedia

    en.wikipedia.org/wiki/Glass_code

    The international glass code is based on U.S. military standard MIL-G-174, and is a six-digit number specifying the glass according to its refractive index n d at the Fraunhofer d- (or D 3-) line, 589.3 nm, and its Abbe number V d also taken at that line.

  3. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    Man with glasses. A woman with glasses. Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.

  4. Bifocals - Wikipedia

    en.wikipedia.org/wiki/Bifocals

    Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia , hyperopia , and/or astigmatism .

  5. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    A visual acuity of 6/6 is frequently described as meaning that a person can see detail from 6 metres (20 ft) away the same as a person with "normal" eyesight would see from 6 metres. If a person has a visual acuity of 6/12, they are said to see detail from 6 metres (20 ft) away the same as a person with "normal" eyesight would see it from 12 ...

  6. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...

  7. Lawrence R. Ricciardi - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/lawrence-r-ricciardi

    From January 2009 to December 2012, if you bought shares in companies when Lawrence R. Ricciardi joined the board, and sold them when he left, you would have a -44.6 percent return on your investment, compared to a 53.1 percent return from the S&P 500.

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