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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.
A Fresnel lens is a compact lens that reduces the amount of material required compared to a conventional lens by dividing it into concentric sections. Learn how Augustin-Jean Fresnel invented and improved this lens for use in lighthouses, and how it works with refraction and reflection.
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.
Learn about the evolution of binoculars from the 17th century to the present, from Galilean to Porro to roof prism designs. Find out how optical prisms, lenses and mirrors enable binoculars to produce erect and three-dimensional images of distant objects.
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.
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