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History of Bifocal Glasses

Glass lenses used as magnifiers date back to about 300 BC but the first eyeglasses to aid vision were invented in Italy by Alessandro Della Spina and Alvino Degli Armati. Convex lenses were prescribed...

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Characteristics of Bifocal Glasses

Introduction: Those prescription glasses having such lenses which possess two separate optical powers are known as bifocal glasses. These are most suitable for those individuals who suffer from...

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