What is the difference between cylinder and ADD power for eye glasses, and how do they work when they are applied on the same lens? - Quora
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Eyeglasses Buying Guide: How to Buy Eyeglasses and Sunglasses -- Pay Less and Get More: Agnew, Mark: 9781732655706: Amazon.com: Books
![Eyeglasses Buying Guide: How to Buy Eyeglasses and Sunglasses -- Pay Less and Get More: Agnew, Mark: 9781732655706: Amazon.com: Books Eyeglasses Buying Guide: How to Buy Eyeglasses and Sunglasses -- Pay Less and Get More: Agnew, Mark: 9781732655706: Amazon.com: Books](https://m.media-amazon.com/images/I/715Os0+5y0L._AC_UF1000,1000_QL80_.jpg)