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You get to see Lisa Kaplan Gordon in As Seen on TV review videos on WalletPop's Consumer Ally section every week, but thanks to the folks at the McLean Ear in Virginia, you can learn a bit more ...
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.