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2. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.

3. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   A corrective lens is a device that improves visual perception by correcting refractive errors. Learn about the different types of corrective lenses, such as glasses, contact lenses, intraocular lenses, and their prescriptions, uses, and advantages.

4. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.

5. I tried those Pair Eyewear glasses with the magnetic frames ...

   www.aol.com/lifestyle/tried-those-pair-eyewear...

   Pair Eyewear lets you change your glasses by snapping on different magnetic tops. You can choose from dozens of styles, colors and themes, and save 15 percent with promo code YAHOO15.

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.

7. Zenni Optical - Wikipedia

   en.wikipedia.org/wiki/Zenni_Optical

   Zenni Optical is an American company that sells prescription glasses, sunglasses, and contact lenses online. Founded in 2003, it offers low prices, diverse options, and themed glasses, but has low customer support and return policy.