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A dioptre ( British spelling) or diopter ( American spelling ), symbol dpt, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m−1. It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length ...
Optometer (ophthalmic instrument) The optometer was a device used for measuring the necessary spherical and/or cylindrical corrections to be prescribed for eyeglasses, from the middle of the 18th century until around 1922, when modern instruments were developed. [1] [2] [3] The term, coined in 1738 by W. Porterfield to describe his Scheiner ...
It is the world's twelfth-most-populous country, with diverse ethnicities and cultures. Manila is the country's capital, and its most populated city is Quezon City. Both are within Metro Manila . Negritos, the archipelago's earliest inhabitants, were followed by waves of Austronesian peoples.
Focometer. A focometer is an instrument that measures refractive errors and is intended to provide rural or economically disadvantaged populations spherical eyeglass prescriptions without the need for complicated protocols, expensive equipment, or electricity. [1] [2] The focometer is monocular and hand-held, and is normally used in natural ...
Trusit Dave "Automated refraction - Design and applications" in "Optometry Today" 04/06/04 "This Company Is Bringing Eye Exams (And Glasses) To People Who Can't Afford Healthcare". Read about Smart Vision Labs in "Business Insider" 09/29/14 ; PIKE Ophthalmic, image.
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whether a person has strabismus. In the fields of optometry and ophthalmology, the Hirschberg test, also Hirschberg corneal reflex test, is a screening test that can be used to assess whether a person has strabismus (ocular misalignment). A photographic version of the Hirschberg is used to quantify strabismus. [1]
Cultural practice is the manifestation of a culture or sub-culture, especially in regard to the traditional and customary practices of a particular ethnic or other cultural groups. The term is gaining in importance due to the increased controversy over "rights of cultural practice", which are protected in many jurisdictions for indigenous ...
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