Definition of "varifocal" []

• Having a variable focal length, with focus that changes in synchronization (adjective)

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• ""I've always liked 3D," declares Martin Scorsese breezily, his brown eyes twinkling from behind the trademark black-rimmed glasses which seem larger and more impressively varifocal in real life."
• "GlassesFramesandLenses.com can fulfil any prescription and the company is now the only online prescription glasses retailer to offer “back-surfaced” varifocal technology."
• ""We are an on-line company, run and owned by a qualified Optician , you can order all single vision on the website, but the more complicated varifocal and bifocals are done over the phone where more information is needed and greater advice offered!" explained a spokesperson."