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2. Hakim Optical - Wikipedia

   en.wikipedia.org/wiki/Hakim_Optical

   Karim Hakimi, a native of Iran, learned to make lenses from old window glass as a child. After a stint in the navy, Hakimi worked in the optical industry in Switzerland. [1] He then migrated to Canada and opened an optical laboratory in the former Elmwood Hotel (now the Elmwood Spa) in downtown Toronto, Ontario. [2]

3. 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.

4. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Glasses, also known as eyeglasses and ... free market competition inflates the prices of frames, which cost an average of $25–$50 U.S. to make, to an average retail ...

5. 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 ...

6. Clearly - Wikipedia

   en.wikipedia.org/wiki/Clearly

   clearly.ca. Clearly is an online retailer of contact lenses, eyeglasses and sunglasses. The company was acquired by EssilorLuxottica Canada, and is headquartered in Vancouver, British Columbia. [1] They are one of the largest online contact lens retailers in North America, and the largest seller of prescription eyeglasses online in the world.

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]