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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. Walgreens and CVS warned about selling illegal eye products - AOL

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4. US accuses Regeneron of fraudulent price reporting for eye drug

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   BOSTON (Reuters) -The U.S. Justice Department on Wednesday accused Regeneron Pharmaceuticals of manipulating Medicare's drug-pricing process by inflating the average sales price for its expensive ...

5. FDA sends warning to CVS, Walgreens and other companies ... - AOL

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   The US Food and Drug Administration on Monday sent warning letters to CVS, Walgreens and other companies over manufacturing and marketing of unapproved eye products the agency says could pose a ...

6. Prism cover test - Wikipedia

   en.wikipedia.org/wiki/Prism_Cover_Test

   The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]

7. Aberrations of the eye - Wikipedia

   en.wikipedia.org/wiki/Aberrations_of_the_eye

   Aberrations of the eye. The eye, like any other optical system, suffers from a number of specific optical aberrations. The optical quality of the eye is limited by optical aberrations, diffraction and scatter. [1] Correction of spherocylindrical refractive errors has been possible for nearly two centuries following Airy's development of methods ...

8. FDA warns CVS, Walgreens, other companies over unapproved eye ...

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   Many of these products claim to be drugs that could treat conditions and symptoms including conjunctivitis (“pink eye”), cataracts, glaucoma, dry eye, and… FDA warns CVS, Walgreens, other ...

9. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Corrective lens. A pair of contact lenses, positioned with the concave side facing upward. 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.