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2. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]

3. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye.

4. Prism (optics) - Wikipedia

   en.wikipedia.org/wiki/Prism_(optics)

   Prism (optics) A familiar dispersive prism. An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base ...

5. The Best Face Masks for Kids, According to Doctors - AOL

   www.aol.com/news/best-face-masks-kids-185106412.html

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6. How to Keep Your Glasses from Fogging Up When Wearing A Face Mask

   www.aol.com/keep-glasses-fogging-wearing-face...

   “Face masks help block the respiratory droplet spread of infection from the person wearing the mask, which can occur by simply speaking to someone at a close distance,” says Sunitha D. Posina ...

7. New face mask for your kids? Start here. - AOL

   www.aol.com/face-mask-kids-start-221255741.html

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