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  2. List of soft contact lens materials - Wikipedia

    en.wikipedia.org/wiki/List_of_soft_contact_lens...

    The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...

  3. Comparison of YouTube downloaders - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_YouTube_down...

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  4. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    Contact lens. A pair of contact lenses, positioned with the concave side facing upward. Putting contacts in and taking them out. One-day disposable contact lenses with blue handling tint in blister-pack packaging. Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic ...

  5. Polyvinylpyrrolidone - Wikipedia

    en.wikipedia.org/wiki/Polyvinylpyrrolidone

    PVP is used in some contact lenses and their packaging solutions. It reduces friction, thus acting as a lubricant, or wetting agent, built into the lens. Examples of this use include Bausch & Lomb's Ultra contact lenses with MoistureSeal Technology and Air Optix contact lens packaging solution (as an ingredient called "copolymer 845").

  6. Opticks - Wikipedia

    en.wikipedia.org/wiki/Opticks

    Opticks: or, A Treatise of the Reflexions, Refractions, Inflexions and Colours of Light is a book by Isaac Newton that was published in English in 1704 (a scholarly Latin translation appeared in 1706). [1] The book analyzes the fundamental nature of light by means of the refraction of light with prisms and lenses, the diffraction of light by ...

  7. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    A telescopic sight, commonly called a scope informally, is an optical sighting device based on a refracting telescope. [1] It is equipped with some form of a referencing pattern – known as a reticle – mounted in a focally appropriate position in its optical system to provide an accurate point of aim.

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