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

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

   In fact, as many as 34.5 million Americans wear over-the-counter reading glasses, according to the Vision Council. Luckily, reading glasses are easy to get practically anywhere—and they come in ...

3. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...

4. Refractive error - Wikipedia

   en.wikipedia.org/wiki/Refractive_error

   The individual would experience difficulty in near vision, often relieved by reading glasses, bifocal, or progressive lenses. [14] Astigmatism is when the refractive power of the eye is not uniform across the surface of the cornea because of asymmetry. In other words, the eye focuses light more strongly in one direction than another, leading to ...

5. Presbyopia - Wikipedia

   en.wikipedia.org/wiki/Presbyopia

   Corrective lenses provide vision correction over a range as high as +4.0 diopters. People with presbyopia require a convex lens for reading glasses; specialized preparations of convex lenses usually require the services of an optometrist. [15] Contact lenses can also be used to correct the focusing loss that comes along with presbyopia.

6. Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Visual_acuity

   In the expression 6/x vision, the numerator (6) is the distance in metres between the subject and the chart and the denominator (x) the distance at which a person with 6/6 acuity would discern the same optotype. Thus, 6/12 means that a person with 6/6 vision would discern the same optotype from 12 metres away (i.e. at twice the distance).

7. AOL-reviewed: The Renpho eye massager has almost 17,000 five ...

   www.aol.com/lifestyle/renpho-eyeris-review...

   I went from having perfect vision to wearing progressive lenses, increasing prescription strength every year. ... It does take 3-3.5 hours to fully charge and I get about six 20-minutes sessions ...