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  2. Toric lens - Wikipedia

    en.wikipedia.org/wiki/Toric_lens

    A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus (see figure at right), and the other one is usually spherical. Such a lens behaves like a combination of a spherical lens and a cylindrical lens.

  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. CooperVision - Wikipedia

    en.wikipedia.org/wiki/CooperVision

    CooperVision. CooperVision in Ontario. CooperVision, Inc. is a business unit of The Cooper Companies, Inc.. It is primarily a soft contact lens manufacturer. The company was founded in 1980, and it's headquarters are in Pleasanton, California. Its products are sold in over 100 countries.

  5. Reverse Polish notation - Wikipedia

    en.wikipedia.org/wiki/Reverse_Polish_notation

    Soviet programmable calculators (MK-52, MK-61, B3-34 and earlier B3-21 [60] models) used reverse Polish notation for both automatic mode and programming. Modern Russian calculators MK-161 [61] and MK-152, [62] designed and manufactured in Novosibirsk since 2007 and offered by Semico, [63] are backwards compatible with them. Their extended ...

  6. Toric code - Wikipedia

    en.wikipedia.org/wiki/Toric_code

    It has been found that this is possible in the toric code only if long range interactions are present between anyons. [ 15 ] [ 16 ] Proposals have been made for realization of these in the lab [ 17 ] Another approach is the generalization of the model to higher dimensions, with self-correction possible in 4D with only quasi-local interactions.

  7. Curta - Wikipedia

    en.wikipedia.org/wiki/Curta

    A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.

  8. TI-92 series - Wikipedia

    en.wikipedia.org/wiki/TI-92_series

    Voyage 200 (also V200 and Voyage 200 PLT) was released in 2002, being the replacement for the TI-92 Plus, with its only hardware upgrade over that calculator being an increase in the amount of flash memory available (2.7 megabytes for the Voyage 200 vs. 702 kilobytes for the TI-92 Plus). It also features a somewhat smaller and more rounded case ...

  9. Scientific calculator - Wikipedia

    en.wikipedia.org/wiki/Scientific_calculator

    A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic ( addition, subtraction, multiplication, division) and complex ( trigonometric, hyperbolic, etc.) mathematical operations and functions. They have completely replaced slide rules as well as books of mathematical tables ...

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