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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 7 Best Places to Buy N95, KN95 and KF94 Face Masks for ...

   www.aol.com/8-best-places-buy-n95-203000418.html

   1. Vida Kids Mask with KN95 Protection. These USA-made kids’ masks feature a five-layer filtration system and a 95 to 99 percent efficiency, per Vida’s website. (And according to Collins ...

6. History of optics - Wikipedia

   en.wikipedia.org/wiki/History_of_optics

   History of optics. Modern ophthalmic lens making machine. Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek philosophers, and the development of geometrical optics in the Greco-Roman world. The word optics is derived from the Greek term ...

7. Disposable masks can take up to 450 years to decompose ... - AOL

   www.aol.com/lifestyle/disposable-masks-450-years...

   That’s three-quarters of 129 billion masks that end up in the trash monthly — or 3.4 billion daily — according to one frequently cited estimate of global mask use, and that’s on top of all ...