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2. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]

3. Diplopia - Wikipedia

   en.wikipedia.org/wiki/Diplopia

   The provider may prescribe an eye patch to relieve the double vision. The patch can be removed after the nerve heals. Surgery or special glasses (prisms) may be advised if there is no recovery in 6 to 12 months. If diplopia turns out to be intractable, it can be managed as last resort by obscuring part of the patient's field of view.

4. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.

5. Compound prism - Wikipedia

   en.wikipedia.org/wiki/Compound_prism

   The simplest compound prism is a doublet, consisting of two elements in contact, as shown in the figure at right. A ray of light passing through the prism is refracted at the first air-glass interface, again at the interface between the two glasses, and a final time at the exiting glass-air interface. The deviation angle of the ray is given by ...

6. ‘Pommel Horse Guy’ Stephen Nedoroscik Wears Glasses Due to 2 ...

   www.aol.com/lifestyle/pommel-horse-guy-stephen...

   This can cause the brain to see two images or double vision. Coloboma involves missing eye tissue. ... “While [prism glasses] do not physically realign the eyes, they allow the images that are ...

7. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   In roof prism designs, optically relevant prism angles must be correct within 2 arcseconds (⁠ 1 / 1,800 ⁠ of 1 degree) to avoid seeing an obstructive double image. Maintaining such tight production tolerances for the alignment of their optical elements by laser or interference (collimation) at an affordable price point is challenging.