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2. Zenni Optical - Wikipedia

   en.wikipedia.org/wiki/Zenni_Optical

   www .zennioptical .com. Zenni Optical (formerly 19dollareyeglasses.com) is an American online retailer of prescription glasses and sunglasses. Founded in 2003 by Tibor Laczay and Julia Zhen, it is based in Novato, California . The company sells more than 2,000 types of prescription glasses and sunglasses as well as 45 types of contact lenses.

3. Prism (optics) - Wikipedia

   en.wikipedia.org/wiki/Prism_(optics)

   Prism (optics) An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.

4. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

5. 32 Free Things That Are Only a Click Away - AOL

   www.aol.com/32-free-things-only-click-225854733.html

   FreeSamples.org. Freesamples.org is a portal that gives you access to freebies such as household items. You also can find coupons for products and local restaurants. Get the free stuff you want by ...

6. Budget Better: 17 things you should always buy in bulk - AOL

   www.aol.com/article/finance/2016/07/11/budget...

   There’s nothing worse than going to the store and realizing that you’ve purchased more than you need, but in some cases, it (literally) pays to buy in bulk.

7. Glass code - Wikipedia

   en.wikipedia.org/wiki/Glass_code

   The international glass code is based on U.S. military standard MIL-G-174, and is a six-digit number specifying the glass according to its refractive index nd at the Fraunhofer d- (or D 3 -) line, 589.3 nm, and its Abbe number Vd also taken at that line. The resulting glass code is the value of nd − 1 rounded to three digits, followed by Vd ...