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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]
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 [ edit ]
Corrective lens. A pair of contact lenses, positioned with the concave side facing upward. 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.
The Central Bank of Sri Lanka has issued commemorative coins since 1957. On 15 December 2010, to mark the 60th Anniversary, the Central Bank of Sri Lanka issued a Frosted Proof crown size multi-colour silver commemorative coin in the denomination of Rupees 5000. It was the first multi-colour coin issued by the Central Bank.
Sri Lanka is considering the possibility of allowing the use of the Indian rupee for local transactions, as the island nation struggles to build its depleted foreign reserves and to emerge from ...
For 15 years, Rasalingam Thilakawathi has been trying to find out what happened to her daughter at the end of Sri Lanka’s bloody civil war. The last evidence she has is a photo from a newspaper ...
The Sri Lankan Rupee ( Sinhala: රුපියල්, Tamil: ரூபாய்; symbol: Re and Rs (plural) in English, රු in Sinhala, ௹ in Tamil; ISO code: LKR) is the currency of Sri Lanka. It is subdivided into 100 cents ( Sinhala: සත, Tamil: சதம் ), but cents are rarely seen in circulation due to its low value. It is ...
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]
The banknotes of the Sri Lanka rupee are part of the physical form of Sri Lanka 's currency. The issuance of the rupee banknotes began in 1895. The Government of Ceylon introduced its first paper money in the form of the 5 rupee banknote in 1895. These were followed by 10 rupee notes in 1894, 1000 rupee notes in 1899, 50 rupee notes in 1914, 1 ...
This is a survey of the postage stamps and postal history of Sri Lanka, formerly known as Ceylon . Sri Lanka is an island country in South Asia, located about 31 km off the southern coast of India. After over two thousand years of rule by local kingdoms, parts of Sri Lanka were colonized by Portugal and the Netherlands beginning in the 16th ...