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Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
The prism cover test (PCT) is an objective method to measure ocular misalignment or strabismus. It involves using prism bars, occluder and targets to neutralise the deviation and record the angle and base of the prism.
"The correction and management of ametropia in older patients" David B Elliott PhD, MCOptom, FAAO Investigative Ophthalmology and Visual Science. 2004;45:2122–2128.) Stepping Up to a New Level: Effects of Blurring Vision in the Elderly Heasley K, Buckley J G, Elliott D B "Monovision: a review" Evans BJ Ophthalmic Physiol Opt. 2007 Sep;27(5 ...
A corrective lens is a device that improves visual perception by correcting refractive errors. Learn about the different types of corrective lenses, such as glasses, contact lenses, intraocular lenses, and their prescriptions, uses, and advantages.
Learn about different kinds of color correcting lenses that claim to alleviate color blindness, such as disparate, monocular, binocular, tinted and notch filters. Find out why most lenses are not recommended or approved by experts and may have negative side effects.
The Prentice position. The Prentice position is an orientation of a prism, used in optics, optometry and ophthalmology. [1] In this position, named after the optician Charles F. Prentice, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface.
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