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2. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   They are available in common reading prescriptions with strengths ranging from +0.75 to +3.50 diopters. While these "magnifiers" do indeed make the image of the viewed object bigger, their main advantage comes from focusing the image, not magnification. These glasses are not tailored to a person's individual needs.

3. NOBLEX E-Optics GmbH - Wikipedia

   en.wikipedia.org/wiki/NOBLEX_E-Optics_GmbH

   NOBLEX E-Optics GmbH, formerly Docter Optics, is a German manufacturer of optics, including binoculars, rifle scopes, spotting scopes, red dot sights, flashlights and reading glasses. Its headquarters are in Eisfeld, Thuringia, Germany, where most of the products are developed and manufactured. Docter is part of the Analytik Jena Group. [1]

4. Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Visual_acuity

   Ultimately, however, it appears that the size of a patch of cortical tissue in visual area V1 that processes a given location in the visual field (a concept known as cortical magnification) is equally important in determining visual acuity. In particular, that size is largest in the fovea's center, and decreases with increasing distance from there.

5. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.

6. Presbyopia - Wikipedia

   en.wikipedia.org/wiki/Presbyopia

   Presbyopia can be corrected using glasses, contact lenses, multifocal intraocular lenses, or LASIK (PresbyLASIK) surgery. [2] [7] [4] The most common treatment is glass correction using appropriate convex lens. Glasses prescribed to correct presbyopia may be simple reading glasses, bifocals, trifocals, or progressive lenses. [4]

7. Numerical aperture - Wikipedia

   en.wikipedia.org/wiki/Numerical_aperture

   [3] [5] The magnification here is typically negative, and the pupil magnification is most often assumed to be 1 — as Allen R. Greenleaf explains, "Illuminance varies inversely as the square of the distance between the exit pupil of the lens and the position of the plate or film. Because the position of the exit pupil usually is unknown to the ...