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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]
Specialty. Neurology, ophthalmology. 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.
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 ...
Ophthalmology. In ophthalmology, horror fusionis is a condition in which the eyes have an unsteady deviation, with the extraocular muscles performing spasm-like movements that continuously shift the eyes away from the position in which they would be directed to the same point in space, giving rise to diplopia. Even when the double vision images ...
Incomitant strabismus cannot be fully corrected by prism glasses, because the eyes would require different degrees of prismatic correction dependent on the direction of the gaze. Incomitant strabismus of the eso- or exo-type are classified as "alphabet patterns": they are denoted as A- or V- or more rarely λ -, Y- or X-pattern depending on the ...
For an introductory guide on IPA symbols, see Help:IPA. Urdu ( / ˈʊərduː /; اردو, [ʊɾduː] ⓘ; ALA-LC: Urdū) is an Indo-Aryan language spoken chiefly in South Asia. [10] [11] It is the national language and lingua franca of Pakistan, where it is also an official language alongside English. [12]
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 ...
The official languages of the country are Dari and Pashto, as established by the 1964 Constitution of Afghanistan. Dari is the most widely spoken language of Afghanistan's official languages and acts as a lingua franca for the country. In 1980, other regional languages were granted official status in the regions where they are the language of ...
The National Language Promotion Department (Urdu: اِدارۀ فروغِ قومی زُبان Idāra-ē Farōġ-ē Qaumī Zabān [ɪ.ˈd̪aː.rə.eː fə.ˈroːɣ.eː ˈqɔː.mi zə.ˈbaːn]), formerly known as the National Language Authority (or Urdu Language Authority), is an autonomous regulatory institution established in 1979 to support the advancement and promotion of Urdu, which is the ...
This category contains articles with Urdu-language text. The primary purpose of these categories is to facilitate manual or automated checking of text in other languages. This category should only be added with the {{ Lang }} family of templates, never explicitly. For example {{ Lang | ur |text in Urdu language here}}, which wraps the text with ...