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2. Prism cover test - Wikipedia

   en.wikipedia.org/wiki/Prism_Cover_Test

   measuring strabismus. 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]

3. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base". The base is the thickest part of the lens and is opposite from the apex. Light will be bent towards the base and the image will be shifted towards the apex.

4. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/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.

5. The 7 best websites to buy prescription eyeglasses online - AOL

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6. 10 Great Sites to Buy Cheap Eyeglasses Online - AOL

   www.aol.com/10-great-sites-buy-cheap-140036394.html

   Buying Cheap Eyeglasses Online. Eyecare in general has become a lot more affordable in recent years. There’s even a website offering online eye exams that take 10 minutes or less and only...

7. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   The parameters specified on spectacle prescriptions vary, but typically include the patient's name, power of the lenses, any prism to be included, the pupillary distance, expiration date, and the prescriber's signature.