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  2. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

  3. Alcohol measurements - Wikipedia

    en.wikipedia.org/wiki/Alcohol_measurements

    3.75 US pints. The 60 oz pitcher is usually used with medium 12 oz beer glasses (5 glasses per pitcher). growler: 1.89 L: 64 US fl oz: 1 ⁄ 2 US gallon. Darwin stubby: 2.273 L: 80 imp fl oz: Standard Australian bottle size, equal to half of an Imperial gallon. Later rounded off to 2.25 L (79.18 imp fl oz) after metrication.

  4. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Reducing frame lens size will give the most noticeable improvement in weight for a given material. Ways to reduce the weight and thickness of corrective lenses, in approximate order of importance are these: Choose glasses frames with small lenses; that is to say so that the longest measurement across the lens at any angle is as short as possible.

  5. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    Double" shots (surprisingly not always the size of two single shots, even in the same place) are 40–100 ml (1.4–3.5 imp fl oz; 1.4–3.4 US fl oz). In the UK, spirits are sold in shots of either 25 ml (0.88 imp fl oz; 0.85 US fl oz) (approximating the old fluid ounce) or 35 ml (1.2 imp fl oz; 1.2 US fl oz). [44]

  6. Myopia - Wikipedia

    en.wikipedia.org/wiki/Myopia

    A study of 2,523 children in grades 1 to 8 (age, 5–17 years) found nearly one in 10 (9%) have at least −0.75 diopters of myopia. [146] In this study, 13% had at least +1.25 D hyperopia (farsightedness), and 28% had at least 1.00-D difference between the two principal meridians (cycloplegic autorefraction) of astigmatism .

  7. Refractive error - Wikipedia

    en.wikipedia.org/wiki/Refractive_error

    The individual would experience difficulty in near vision, often relieved by reading glasses, bifocal, or progressive lenses. [14] Astigmatism is when the refractive power of the eye is not uniform across the surface of the cornea because of asymmetry. In other words, the eye focuses light more strongly in one direction than another, leading to ...

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