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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]
Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
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]
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Amazon Prime Air, or simply Prime Air, is a drone delivery service operated by Amazon. The service uses delivery drones to autonomously fly individual packages to customers, and launched in 2022. [1] The service currently operates in two cities in the US, with plans to expand into the UK and Italy in 2024. [2]
Amazon Prime unlocks great discounts and fast delivery—here's how to try it out for free. Amazon Prime unlocks great discounts and fast delivery—here's how to try it out for free. Skip to main ...
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