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ABDO is divided into the following regions within the UK: •ABDO London •ABDO Midlands •ABDO North of England •ABDO South •ABDO Northern Ireland •ABDO Scotland •ABDO Wales. Within each region, a Regional Lead is supported by Sub Regional Leads who between them look after the interests of ABDO members at a local level.
Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.
Prism and Base Prism refers to a displacement of the image through the lens, often used to treat strabismus and other binocular vision disorders. The prism value is measured in prism diopters , and Base refers to the direction of displacement.
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.
Ibn al-Haytham (Alhacen) wrote about the effects of pinhole, concave lenses, and magnifying glasses in his 11th century Book of Optics (1021 CE).
The Louvre Pyramid ( French: Pyramide du Louvre) is a large glass-and-metal structure designed by the Chinese-American architect I. M. Pei. The pyramid is in the main courtyard ( Cour Napoléon) of the Louvre Palace in Paris, surrounded by three smaller pyramids. The large pyramid serves as the main entrance to the Louvre Museum, allowing light ...