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Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.
Significant events of national importance have been occasions for the issue of commemorative notes in Sri Lanka. The Central Bank of Sri Lanka has issued two commemorative notes. In 1998 a 200 rupees note was issued on Independence day to commemorate the 50th Independence Anniversary of the country. The note was issued along with three ...
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 usual recommendation for those needing iseikonic correction is to wear contact lenses. The effect of vertex distance is removed and the effect of center thickness is also almost removed, meaning there is minimal and likely unnoticeable image size difference.
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...
Sri Lankan commemorative coins. 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.