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The APEL is updated periodically; it usually contains more than a dozen types of non-prescription and prescription spectacles and goggles for different duty situations and soldier preferences. In 2010, the APEL was placed under the oversight of the Military Combat Eyewear Protection (MCEP) program under the office of PEO Soldier. [2]
Unlike conventional prescription glasses, pinhole glasses produce an image without the pincushion effect around the edges (which makes straight lines appear curved). While pinhole glasses are claimed to be useful for people who are both near- and far-sighted, they are not recommended [citation needed] for people with over 6 diopters of myopia.
Eyeglasses for a high-diopter nearsighted or farsighted person cause a visible distortion of their face as seen by other people, in the apparent size of the eyes and facial features visible through the eyeglasses. For extreme nearsightedness, the eyes appear small and sunken into the face, and the sides of the skull can be visible through the lens.
Safety glasses or spectacles, although often used as a catch-all term for all types of eye protection, specifically revers to protective equipment that closely resembles common eye wear. To meet most national standards, spectacles must include side shields to reduce the ability of debris to get behind the lenses from the side.
It is a type of refractive error, along with nearsightedness, farsightedness, and astigmatism. [4] Diagnosis is by an eye examination. [4] 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.
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