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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, polarizing and biprism, and how they refract, reflect or split light. Find out how prisms are made, used and affected by various factors such as wavelength, angle, material and coating.
Learn about the different optical designs, evolution and applications of binoculars, or field glasses, which are two refracting telescopes mounted side-by-side for binocular vision. Find out how binoculars give users a three-dimensional image, how they are sized and aligned, and how they are used in various fields.
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.
Upside down goggles are optical instruments that invert the image received by the retinas upside down. They are used to study human visual perception, adaptation, motion sickness, and spatial abilities.
Adjustable focus eyeglasses have one focal length, but it is variable without having to change where one is looking. Possible uses for such glasses are to provide inexpensive eyeglasses for people from low-income groups , developing countries , third world countries or to accommodate for presbyopia.
A dispersive prism is an optical device that uses refraction to split white light into its spectral components (the colors of the rainbow). Learn about the principle, types, history and applications of dispersive prisms, and how they differ from diffraction gratings and mirrors.
Lenticular printing is a technology that creates printed images with an illusion of depth or motion by using lenticular lenses. Learn about the process, variations, effects, materials, history and examples of lenticular printing.
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