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  2. History of photographic lens design - Wikipedia

    en.wikipedia.org/wiki/History_of_photographic...

    Symmetry was discovered in the 1850s to automatically correct the distortion, coma, and transverse chromatic distortions.: 49–50 : 3–6 : 174, 716–717 There are also decentration aberrations arising from manufacturing errors. A real lens will not produce images of expected quality if it is not constructed to or cannot stay in specification.

  3. Bauernfeind prism - Wikipedia

    en.wikipedia.org/wiki/Bauernfeind_prism

    Green side requires reflective coating. A Bauernfeind prism is a type of reflecting prism used to deviate a beam of light by 45° to 60°, depending on its construction, while neither flipping nor rotating the image. [1] It is named for its inventor, the German expert of geodesy Karl Maximilian von Bauernfeind. [2]

  4. Correction fluid - Wikipedia

    en.wikipedia.org/wiki/Correction_fluid

    Correction pen. A correction fluid is an opaque, usually white fluid applied to paper to mask errors in text. Once dried, it can be handwritten or typed upon. It is typically packaged in small bottles, with lids attached to brushes (or triangular pieces of foam) that dip into the fluid. The brush applies the fluid to the paper.

  5. Four prism dioptre reflex test - Wikipedia

    en.wikipedia.org/wiki/Four_prism_dioptre_reflex_test

    assess alignment of both eyes. 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] Through the use of a 4 dioptre base out prism, diplopia is ...

  6. Congenital fourth nerve palsy - Wikipedia

    en.wikipedia.org/wiki/Congenital_fourth_nerve_palsy

    Specialty. Neurology. Congenital fourth nerve palsy is a condition present at birth characterized by a vertical misalignment of the eyes due to a weakness or paralysis of the superior oblique muscle. Other names for fourth nerve palsy include superior oblique palsy and trochlear nerve palsy. [1] When looking to the right/left the nerve/muscle ...

  7. PRISM - Wikipedia

    en.wikipedia.org/wiki/PRISM

    t. e. PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies. [1] [2] [3] The program is also known by the SIGAD US-984XN. [4] [5] PRISM collects stored internet communications based on demands made to internet companies such as Google ...