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  2. Ultra Panavision 70 - Wikipedia

    en.wikipedia.org/wiki/Ultra_Panavision_70

    Ultra Panavision 70 and MGM Camera 65's anamorphic lenses compressed the image 1.25 times, yielding an extremely wide aspect ratio of 2.76:1 (when a 70 mm projection print was used). Ultra Panavision saw much less use than its sibling, the more popular Super Panavision 70 , and was only used on ten films from 1957 to 1966.

  3. Anisometropia - Wikipedia

    en.wikipedia.org/wiki/Anisometropia

    Amblyopia. Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition . [2] [3] Patients may have up to 3D of anisometropia before the condition becomes clinically significant due to headache, eye ...

  4. Maddox rod - Wikipedia

    en.wikipedia.org/wiki/Maddox_rod

    The strength of the prism is increased until the streak of the light passes through the centre of the prism, as the strength of the prism indicates the amount of deviation present. The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens , which refracts light rays so that a point source of light is seen as a ...

  5. Elizabeth II - Wikipedia

    en.wikipedia.org/wiki/Elizabeth_II

    Recorded 2 June 1953. Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 – 8 September 2022) was Queen of the United Kingdom and other Commonwealth realms from 6 February 1952 until her death in 2022. She was queen regnant of 32 sovereign states over the course of her lifetime and remained the monarch of 15 realms by the time of her death.

  6. Petzval field curvature - Wikipedia

    en.wikipedia.org/wiki/Petzval_field_curvature

    The Petzval field curvature is equal to the Petzval sum over an optical system, where is the radius of the i th surface and the n s are the indices of refraction on the first and second side of the surface. [4] Petzval curvature of a spherical mirror is double of its curvature and Petzval radius of a mirror is equal to its focal length.

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