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  2. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    by convention, an axis of 90° is vertical, 0° or 180° are horizontal; if the cylinder power is positive, the lens is most convergent 90° from the axis; if the cylinder power is negative, the lens is most divergent 90° from the axis; if the cylinder power is zero, the lens is spherical and has the same power in every meridian

  3. List of optometric abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_optometric...

    Back vertex power CD: Centration distance C/D: Cup–disc ratio CF: Count fingers vision – state distance c/o or c.o. Complains of CT: Cover test c/u: Check up CW: Close work Δ: Prism dioptre D: Dioptres DC: Dioptres cylinder DNA: Did not attend DOB: Date of birth DS: Dioptres sphere DV: Distance vision DVD: Dissociated vertical deviation EF ...

  4. Year zero - Wikipedia

    en.wikipedia.org/wiki/Year_zero

    However, if ages were specified in years and months, such a person would be said to be, for example, 0 years and 6 months or 0.5 years old. This is analogous to the way time is shown on a 24-hour clock: during the first hour of a day, the time elapsed is 0 hours, n minutes.

  5. This Is What Those Numbers on Your Glasses Mean - AOL

    www.aol.com/lifestyle/why-know-those-numbers...

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  6. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    Man with glasses. A woman with glasses. Glasses, also known as eyeglasses, spectacles, or colloquially as specs, 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.

  7. Mark Zuckerberg says this is a make-or-break year for Meta's ...

    www.aol.com/news/mark-zuckerberg-says-break...

    Mark Zuckerberg has spent many billions of dollars trying to build computers people will wear on their faces.. It has yet to happen. But Zuckerberg says 2025 will be a pivotal year for that tech ...

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  9. GI glasses - Wikipedia

    en.wikipedia.org/wiki/GI_glasses

    GI glasses are eyeglasses issued by the American military to its service members. Dysphemisms for them include the most common " birth control glasses " ( BCGs ) and other variants. At one time, they were officially designated as regulation prescription glasses ( RPGs ).