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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.
Learn about the different types of optical prisms, such as dispersive, reflective, beam-splitting and polarizing prisms, and how they refract, reflect or split light. Find out how prisms are made of transparent materials like glass, acrylic or fluorite, and how they can create spectra, images or polarizations.
Learn about optical coatings, thin layers of material that alter the way light reflects and transmits from optical components. Find out how metal coatings such as gold, silver and aluminium are used, and how they compare with dielectric coatings.
A progressive lens is a corrective lens used in eyeglasses to correct presbyopia and other disorders of accommodation. It has a gradient of increasing lens power from top to bottom, and can provide clear vision at different distances. Learn about its history, design, advantages, disadvantages and adaptation.
The prism cover test (PCT) is an objective method to measure ocular misalignment or deviation of the eye. It involves using prism bars, occluder, and targets to neutralise the deviation and record the angle and base of the prism.
Eye glasses with an included prism power is the optical method to reduce a fixation disparity. Different procedures have been proposed to determine the required amount of prism for the individual. Based on prism-FD curves (Fig. 3b), one can find the aligning prism sP 0 that nullifies the naturally prevailing fixation disparity sFD 0. This test ...
Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.
Glasses are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes. They can be used for vision correction, eye protection, cosmetic purposes, or viewing specific visual information.
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