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Astigmatism causes difficulties in seeing fine detail. Astigmatism can be often corrected by glasses with a lens that has different radii of curvature in different planes (a cylindrical lens), contact lenses, or refractive surgery. [5] Astigmatism is quite common. Studies have shown that about one in three people suffers from it.
The name of an individual work within the series name: the Star Wars franchise, named for the Star Wars film; the Three Colours trilogy, named for films with the prefix Three Colours. Do not capitalize or italicize descriptive terms that are not part of an official series title (as with "franchise" and "trilogy" in those two examples).
A style guide is a set of standards for the writing, formatting, and design of documents. [1] A book-length style guide is often called a style manual or a manual of style ( MoS or MOS ). A short style guide, typically ranging from several to several dozen pages, is often called a style sheet .
In order to see a clear image, the eye must focus rays of light on to the light-sensing part of the eye – the retina, which is located in the back of the eye.This focusing – called refraction – is performed mainly by the cornea and the lens, which are located at the front of the eye, the anterior segment.
This article is a list of standard proofreader's marks used to indicate and correct problems in a text. Marks come in two varieties, abbreviations and abstract symbols. Marks come in two varieties, abbreviations and abstract symbols.
There are five heading levels used in writing articles (the top-level one being reserved for the auto-displayed page name). [b] Terms in description lists (example: Glossary of the American trucking industry) Table headers and captions (but not image captions) A link to the page on which that link appears, called a self link
This allows a larger useful field of view, and the remaining astigmatism is symmetrical around the distorted objects, allowing astrometry across the wide field of view. However, the astigmatism can be reduced by including a third curved optical element. When this element is a mirror, the result is a three-mirror anastigmat.