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Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.
The website allows users to select frames by size, shape, color, and material. Zenni tracks their users' frame choices in an Oracle database to give the company a better idea of the inventory it needs to maintain. It provides a widget that allows customers to do an online fitting of eyeglass frames. The first option is Zenni Frame Fit.
A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
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In addition to the sheer convenience of being able to try frames on at home, there’s also the fact that shopping online for prescription glasses usually means more choice — and a lot more savings.
If you've never ordered glasses online before, you'll want to be sure to have an updated prescription close at hand, complete with pupillary distance (PD) measurements.
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