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2. 10 Great Sites to Buy Cheap Eyeglasses Online - AOL

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

   Warby usually takes five to 10 business days to ship your order, with home try-ons arriving in about five days. 2. Zenni Optical. Probably one of the cheapest online eyewear stores out there ...

3. Best and worst places to buy your next pair of glasses - AOL

   www.aol.com/news/2010-11-02-best-worst-places-to...

   Choose designer frames, ultra-thin lenses, progressive lenses and lens coatings and it's easy to drop over $400 for the pair. Bad service and poor quality would make the experience even more painful.

4. Snag a pair of Amazon's smart glasses on sale ahead of Prime Day

   www.aol.com/snag-pair-amazons-smart-glasses...

   SAVE $150: As of June 23, Amazon's high-tech Echo Frames are a cool $150 off the original price ahead of Prime Day. Prime members can grab a pair for just $99.99.Are you an early adopter of the ...

5. Zenni Optical - Wikipedia

   en.wikipedia.org/wiki/Zenni_Optical

   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.

6. Adjustable-focus eyeglasses - Wikipedia

   en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

   Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...

7. 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]