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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. 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]

4. Ink cartridge - Wikipedia

   en.wikipedia.org/wiki/Ink_cartridge

   Ink cartridge. Two cartridges (one with black ink (a third-party type HP 15-compatible cartridge), one with colored inks (an original type HP 17 tri-color cartridge)) installed in an HP inkjet printer. An ink cartridge or inkjet cartridge is the component of an inkjet printer that contains the ink to be deposited onto paper during printing. [1]

5. Refractive error - Wikipedia

   en.wikipedia.org/wiki/Refractive_error

   This means that the refractive power of the eye matches what is needed to focus parallel rays of light onto the retina. A distant object is defined as an object located beyond 6 meters (20 feet) from the eye. When an object is located close to the eye, the rays of light from this object no longer approach the eye parallel to each other.

6. Walmart has a Canon all-in-one printer for $29, and I ... - AOL

   www.aol.com/lifestyle/walmart-canon-one-printer...

   Works for me! Enter the Canon Pixma MG2522 all-in-one, currently on sale at Walmart for just $29. You'd be hard-pressed to buy a single ink cartridge for $29, let alone an entire printer. $29 $40 ...

7. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   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.