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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.
Presbyopia is a typical part of the aging process. [4] It occurs due to age related changes in the lens (decreased elasticity and increased hardness) and ciliary muscle (decreased strength and ability to move the lens), causing the eye to focus right behind rather than on the retina when looking at close objects. [4]
The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]
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 ...
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria. Cause. Causes include: Refractive errors; Divergence insufficiency; Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies.
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]
A new vibe at the Woodstock of capitalism. Berkshire Hathaway's ( BRK-A, BRK-B) annual shareholder meeting on Saturday marked a new era for the Oracle of Omaha, Warren Buffett. It’s the ...
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 Indo-Iranian languages (also known as Indo-Iranic languages [1] [2] or collectively the Aryan languages [3]) constitute the largest and southeasternmost extant branch of the Indo-European language family. They include over 300 languages, spoken by around 1.5 billion speakers, predominantly in South Asia, West Asia and parts of Central Asia .