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Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base". The base is the thickest part of the lens and is opposite from the apex. Light will be bent towards the base and the image will be shifted towards the apex. In an eyeglass prescription, the base is typically specified as up, down, in, or out, but left and right are also ...
A trial frame is a tool used by ophthalmic professionals like ophthalmologists and optometrists. It is basically an adjustable spectacle frame with multiple cells, used to hold corrective lenses, and other accessories in subjective refraction (finding the correct spectacle power) and retinoscopy .
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. Contact lenses are worn directly on the surface of the eye. Intraocular lenses are surgically implanted ...
An Historical Account of Two Notable Corruptions of Scripture is a dissertation by the English mathematician and scholar Isaac Newton. This was sent in a letter to John Locke on 14 November 1690. In fact, Newton may have been in dialogue with Locke about this issue much earlier. While living in France, Locke made a journal entry, dated 20 December 1679, where he indicates that while visiting ...
George Malcolm Stratton (September 26, 1865 – October 8, 1957) was an American psychologist who pioneered the study of perception in vision by wearing special glasses which inverted images up and down and left and right. He studied under one of the founders of modern psychology, Wilhelm Wundt, and started one of the first experimental psychology labs in America, at the University of ...
John 6 is the sixth chapter of the Gospel of John in the New Testament of the Christian Bible. It records Jesus' miracles of feeding the five thousand and walking on water, the Bread of Life Discourse, popular rejection of his teaching and Peter 's confession of faith.
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