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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 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.
A corrective lens is a device that improves visual perception by correcting refractive errors. Learn about the different types of corrective lenses, such as glasses, contact lenses, intraocular lenses, and their prescriptions, uses, and advantages.
Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia ) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both.
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.
Bifocals are eyeglasses with two distinct optical powers, commonly prescribed to people with presbyopia. Benjamin Franklin is generally credited with the invention of bifocals, but there is some evidence that others may have come before him.