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2. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   This specifies the part of the prescription designed primarily to improve far vision. In a bifocal lens, this generally indicates what is to be placed in the top segment. NV is an abbreviation for near vision. This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens.

3. Near visual acuity - Wikipedia

   en.wikipedia.org/wiki/Near_visual_acuity

   Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.

4. List of optometric abbreviations - Wikipedia

   en.wikipedia.org/wiki/List_of_optometric...

   Visual acuity with Near chart without correctors Visual acuity with eye chart at Near 15.7 inches (400 mm) and without (sc: Latin sine correctore) correctors (spectacles); Ncc is with (cc: Latin cum correctore) correctors. See Visual_acuity#Legal_definitions: VA OS Left visual acuity VA OD Right visual acuity VDU Visual display unit VF Visual field

5. These Stylish, Doctor-Approved Reading Glasses Can Help ... - AOL

   www.aol.com/best-doctor-approved-reading-glasses...

   When reading glasses are made to your unique prescription and measured for your eyes, the quality of vision is far superior compared to OTC reading glasses, adds Caroline Cho, O.D., optometrist at ...

6. Phantogram (optical illusion) - Wikipedia

   en.wikipedia.org/wiki/Phantogram_(optical_illusion)

   Phantograms, also known as Phantaglyphs, Op-Ups, free-standing anaglyphs, levitated images, and book anaglyphs, are a form of optical illusion.Phantograms use perspectival anamorphosis to produce a 2D image that is distorted in a particular way so as to appear, to a viewer at a particular vantage point, three-dimensional, standing above or recessed into a flat surface.

7. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Reading glasses are available without prescription from drugstores, and offer a cheap, practical solution, though these have a pair of simple lenses of equal power, and so will not correct refraction problems like astigmatism or refractive or prismatic variations between the left and right eye. For the total correction of the individual's sight ...