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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 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.
Glasses are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes. They can be used for vision correction, eye protection, cosmetic purposes, or viewing specific visual information.
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.
A lenticular lens is an array of lenses that show different parts of an image when viewed from different angles. Learn about lenticular printing, corrective lenses, screens, 3D TV and color motion picture processes that use lenticular lenses.
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.
Optometry is a health care profession that involves examining the eyes and related structures for defects or abnormalities. An optometrist is a primary healthcare practitioner of the eye and visual system who provides comprehensive eye and vision care, including refraction, detection/diagnosis and management of eye disease, and rehabilitation of visual conditions.