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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.
Refraction is the redirection of a wave as it passes from one medium to another, such as light in air, water or glass. Learn how refraction depends on the wave speed, the angle of incidence and the refractive index, and see how it affects phenomena like rainbows, prisms and optical devices.
Learn about the causes, types, and minimization of chromatic aberration, a failure of a lens to focus all colors to the same point. Find out how achromatic lenses, diffractive optical elements, and low dispersion glasses can correct or reduce this optical defect.
Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors. Learn about the history, models, and applications of this effect, as well as the factors that affect its perception and reversal.
Learn about different types of corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eyecare professionals. Find out how to choose the right lens for your vision needs, whether it is single vision, bifocal, trifocal, progressive, or multifocal.
Learn about the origins and development of optics from ancient times to modern days. Find out who are the pioneers of geometrical optics, physical optics, and modern optics, and what are their contributions and discoveries.
Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.