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Aban Pestonjee ( Sinhala: අබාන් පෙස්ටොන්ජි) is the chairperson and founder of the Abans group of companies. She is known as one of the first entrepreneurs who initiated in first bringing Korean technology to Sri Lankan consumers. Pestonjee launched her business in 1968 in her home garage where she managed to ...
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]
Footnotes / references[1] Abans PLC also known as Abans Group is a Sri Lankan public limited company and a diversified conglomerate in Sri Lanka engaged in ICT, retail, manufacturing, logistics, commercial real estate and financial services. Abans predominantly functions mainly as a consumer retailer selling various electronic appliances, smart ...
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]
Amblyopia. Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition . [2] [3] Patients may have up to 3D of anisometropia before the condition becomes clinically significant due to headache, eye ...
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.