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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]
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]
History of optics. Modern ophthalmic lens making machine. Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek philosophers, and the development of geometrical optics in the Greco-Roman world. The word optics is derived from the Greek term ...
Andre Jenny. The death of a 12-year-old boy at a North Carolina wilderness camp for troubled adolescents has been ruled a homicide, according to an autopsy report released Monday. The boy died in ...
Nearly 45,000 children received care for pink eye at a doctor's office, eye clinic or emergency room and 69% were prescribed antibiotics, which come in drops and ointments. Whether they were ...
The last act of the night, 9-year-old singer Pranysqa Mishra from Tampa, Fla, gave proof to her words. Her rendition of Tina Turner ’s “River Deep Mountain High” earned her Heidi Klum ’s ...
In the News is an American series of two-minute televised video segments that summarized topical news stories for children and pre-teens. The segments were broadcast in the United States on the CBS television network from 1971 until 1986, between Saturday morning animated cartoon programs, alongside features like Schoolhouse Rock! and One to Grow On, which aired on competing networks ABC and ...
Corrective lens. 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.