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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 corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eye care professionals. Find out how they improve visual perception and treat refractive errors, and the advantages and disadvantages of over-the-counter and self-selected lenses.
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 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.
Vertex distance is the distance between the back surface of a corrective lens and the front of the cornea. It affects the optical properties and power of the lens relative to the eye. Learn how to calculate and adjust vertex distance for glasses and contacts.
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.
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