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Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally or vertically in relation to each other. [1] Also called double vision, it is a loss of visual focus under regular conditions, and is often voluntary. However, when occurring involuntarily, it results from impaired function of the extraocular muscles, where both eyes are still functional ...
The Maddox rod test can be used to subjectively detect and measure a latent, manifest, horizontal or vertical strabismus for near and distance. The test is based on the principle of diplopic projection. [1] Dissociation of the deviation is brought about by presenting a red line image to one eye and a white light to the other, while prisms are ...
Strabismus can occur due to muscle dysfunction, farsightedness, problems in the brain, trauma, or infections. [3] Risk factors include premature birth, cerebral palsy, and a family history of the condition. [3] Types include esotropia, where the eyes are crossed ("cross eyed"); exotropia, where the eyes diverge ("lazy eyed" or "wall eyed"); and hypertropia or hypotropia where they are ...
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Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
Persian and Urdu are distinct languages. Persian is classified as an Iranian language, whereas Urdu is an Indo-Aryan language. They fall under the larger grouping of the Indo-Iranian languages, and hence share some linguistic features due to common descent . However, the majority of influence from Persian is direct, through a process often ...
Conversely, colloquial registers of Hindi and Urdu are almost completely mutually intelligible, and are sometimes classified as one language, Hindustani. Such rankings should be used with caution, because it is not possible to devise a coherent set of linguistic criteria for distinguishing languages in a dialect continuum.
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U. Urdu-language television channels in the United Kingdom (8 P) Urdu-language television stations in the United States (2 P)
This table lists all two-letter codes (set 1), one per language for ISO 639 macrolanguage , and some of the three-letter codes of the other sets, formerly parts 2 and 3. Language formed from English and Vanuatuan languages, with some French influence. Modern Hebrew. Code changed in 1989 from original ISO 639:1988, iw. [3]