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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 the origins and development of optics from ancient times to modern days. Explore the contributions of Greek, Roman, Islamic, and European scholars to the fields of geometrical, physical, and physiological optics.
Zenni Optical is an American company that sells prescription glasses, sunglasses, and contact lenses online. Founded in 2003, it offers low prices, diverse options, and themed glasses, but has low customer support and return policy.
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.
Essilor is a French company that designs, manufactures and markets lenses to correct or protect eyesight. It was formed in 1972 by the merger of Essel and Silor, and has since acquired several subsidiaries and brands in the eyewear industry.
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