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  2. Architectural glass - Wikipedia

    en.wikipedia.org/wiki/Architectural_glass

    Prism glass can be found on sidewalks, where it is known as vault lighting, [15] in windows, partitions, and canopies, where it is known as prism tiles, and as deck prisms, which were used to light spaces below deck on sailing ships. It could be highly ornamented; Frank Lloyd Wright created over forty different designs for prism tiles. [16]

  3. Prismatic World Tour - Wikipedia

    en.wikipedia.org/wiki/Prismatic_World_Tour

    The Prismatic World Tour was the third concert tour by American singer Katy Perry, in support of her fourth studio album, Prism (2013). The tour began on May 7, 2014, at Belfast, Northern Ireland's Odyssey Arena and ended on October 18, 2015, at Alajuela, Costa Rica's Parque Viva after six legs. [2]

  4. History of glass - Wikipedia

    en.wikipedia.org/wiki/History_of_glass

    The glasses from this period contain high levels of barium oxide and lead, distinguishing them from the soda–lime–silica glasses of Western Asia and Mesopotamia. [27] At the end of the Han Dynasty (AD 220), the lead-barium glass tradition declined, with glass production only resuming during the 4th and 5th centuries AD. [ 28 ]

  5. Four prism dioptre reflex test - Wikipedia

    en.wikipedia.org/wiki/Four_prism_dioptre_reflex_test

    The Four Prism Dioptre Reflex Test (also known as the 4 PRT, or 4 Prism Dioptre Base-out Test) is an objective, non-dissociative test used to prove the alignment of both eyes (i.e. the presence of binocular single vision) by assessing motor fusion. [1]

  6. Cut glass - Wikipedia

    en.wikipedia.org/wiki/Cut_glass

    Bowl of a wine glass in typical cut glass style Cut glass chandelier in Edinburgh. Cut glass or cut-glass is a technique and a style of decorating glass. For some time the style has often been produced by other techniques such as the use of moulding, but the original technique of cutting glass on an abrasive wheel is still used in luxury products.

  7. Bifocals - Wikipedia

    en.wikipedia.org/wiki/Bifocals

    Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia , hyperopia , and/or astigmatism . History

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