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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]
Eyeglass prescription. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient. If an eye examination indicates that corrective lenses are appropriate, the ...
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]
Sarath Fonseka. Field Marshal Gardihewa Sarath Chandralal Fonseka, RWP, RSP, VSV, USP ( Sinhala: ගාර්දිහේවා සරත් චන්ද්රලාල් ෆොන්සේකා, Tamil: சரத் பொன்சேகா; born 18 December 1950), commonly known as Sarath Fonseka, is a retired Sri Lankan army officer and ...
Sri Lanka is a tropical island situated close to the southern tip of India. The bird life of Sri Lanka is very rich for its size and 528 species have been recorded. In addition to the many resident birds, a considerable number of migratory species winter in the country to escape their northern breeding grounds.
This article lists the largest companies in Sri Lanka terms of their revenue, net profit and total assets, according to the American business magazines Fortune and Forbes and local business magazine LMD. 2022 list. This list is based on the LMD, which ranks the largest publicly traded companies.
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