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2. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   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.

3. Prism (optics) - Wikipedia

   en.wikipedia.org/wiki/Prism_(optics)

   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.

4. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   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.

5. Prism cover test - Wikipedia

   en.wikipedia.org/wiki/Prism_Cover_Test

   The prism cover test (PCT) is an objective method to measure ocular misalignment or deviation of the eye. It involves using prism bars, occluder, and targets to neutralise the deviation and record the angle and base of the prism.

6. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   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.

7. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Learn about glasses, also known as eyeglasses and spectacles, which are vision eyewear with clear or tinted lenses mounted in a frame. Find out about corrective, safety, sunglasses and other types of glasses, as well as their history and evolution.