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  2. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Reading glasses are single vision lenses designed for near work and include over the counter glasses. They come in two main styles: full frames, in which the entire lens is made in the reading prescription, and half-eyes, style glasses that sit lower down on the nose . [ 2 ]

  3. 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.

  4. 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 ...

  5. Human eye - Wikipedia

    en.wikipedia.org/wiki/Human_eye

    The eyeball is generally less tall than it is wide. The sagittal vertical (height) of a human adult eye is approximately 23.7 mm (0.93 in), the transverse horizontal diameter (width) is 24.2 mm (0.95 in) and the axial anteroposterior size (depth) averages 22.0–24.8 mm (0.87–0.98 in) with no significant difference between sexes and age ...

  6. Rack unit - Wikipedia

    en.wikipedia.org/wiki/Rack_unit

    Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

  7. Texel - Wikipedia

    en.wikipedia.org/wiki/Texel

    The island is 23.7 km long and 9.6 km wide, its surface is 162.00 square kilometres. [8] The highest point of the island is the dune "Bertusnol" (also "Nol van Bertus"), which is situated in the Dunes of Texel National Park, at 19.6 m. The dune landscape on Texel is an important habitat for wildlife.

  8. Gull - Wikipedia

    en.wikipedia.org/wiki/Gull

    The Pacific gull is a large white-headed gull with a distinctively heavy bill.. Gulls range in size from the little gull, at 120 grams (4 + 1 ⁄ 4 ounces) and 29 centimetres (11 + 1 ⁄ 2 inches), to the great black-backed gull, at 1.75 kg (3 lb 14 oz) and 76 cm (30 in).

  9. Bergamo - Wikipedia

    en.wikipedia.org/wiki/Bergamo

    Bergamo (Italian: [ˈbɛrɡamo] ⓘ; Bergamasque: Bèrghem [ˈbɛrɡɛm] ⓘ) is a city in the alpine Lombardy region of northern Italy, approximately 40 km (25 mi) northeast of Milan, and about 30 km (19 mi) from the alpine lakes Como and Iseo and 70 km (43 mi) from Garda and Maggiore.

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