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Prism spectacles with a single prism perform a relative displacement of the two eyes, thereby correcting eso-, exo, hyper- or hypotropia. In contrast, spectacles with prisms of equal power for both eyes, called yoked prisms (also: conjugate prisms , ambient lenses or performance glasses ) shift the visual field of both eyes to the same extent.
Prentice's rule, named so after the optician Charles F. Prentice, is a formula used to determine the amount of induced prism in a lens: = where: P is the amount of prism correction (in prism dioptres) c is decentration (the distance between the pupil centre and the lens's optical centre, in millimetres)
Prism and Base Prism refers to a displacement of the image through the lens, often used to treat strabismus and other binocular vision disorders. The prism value is measured in prism diopters , and Base refers to the direction of displacement.
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.
Mathematically, one can calculate by concatenating the Snell's law equations at each interface, [2] so that the deviation angle is a nonlinear function of the glass refractive indices and , the prism elements' apex angles and , and the angle of incidence of the ray.
Calculation of glass properties incl. dispersion; Cauchy's equation; Dispersion relation; Fast radio burst (astronomy) Fluctuation theorem; Green–Kubo relations; Group delay; Intramodal dispersion; Kramers–Kronig relations; Linear response function; Multiple-prism dispersion theory; Sellmeier equation; Ultrashort pulse; Virtually imaged ...