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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. 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 ...

  4. Prentice position - Wikipedia

    en.wikipedia.org/wiki/Prentice_position

    Prentice position. The Prentice position is an orientation of a prism, used in optics, optometry and ophthalmology. [1] In this position, named after the optician Charles F. Prentice, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface.

  5. Prism cover test - Wikipedia

    en.wikipedia.org/wiki/Prism_Cover_Test

    The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]

  6. Comparison of cross-platform instant messaging clients

    en.wikipedia.org/wiki/Comparison_of_cross...

    General Client Developer Initial release Platform Latest release License (client) License (server) Monthly active users Version Date BlackBerryMessenger Enterprise Blackberry June 2014 ; 10 years ago (2014-06) iOS, Android Proprietary freeware Proprietary Beeper Nova Technology, Inc. Beeper, Inc. Automattic May 10, 2021 ; 3 years ago (2021-05-10) Android ChromeOS iOS Linux macOS Windows Apache ...

  7. Windows Contacts - Wikipedia

    en.wikipedia.org/wiki/Windows_Contacts

    Website. Windows Contacts. Windows Contacts is a contact manager that is included in Windows Vista, Windows 7, Windows 8, Windows 10, and Windows 11. It replaced but retains most of the functionality of Windows Address Book and worked with Windows Live Mail and the Vista version of Windows Mail . Windows Contacts uses an XML -based schema format.

  8. List of model checking tools - Wikipedia

    en.wikipedia.org/wiki/List_of_model_checking_tools

    A list of verification tools for probabilistic, stochastic, hybrid, and timed systems. Common benchmarks. MCC (models of the Model Checking Contest): a collection of hundreds of Petri nets originating from many academic and industrial case studies. VLTS (Very Large Transition Systems): a collection of Labelled Transition Systems of increasing ...

  9. Prism (optics) - Wikipedia

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

    Prism (optics) 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 and rectangular sides.

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