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What is a bifocal lens and what are the features of a bifocal lens?

April 26, 2017bifocal features Lens

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What is a bifocal lens and what are the features of a bifocal lens?

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A bifocal lens is a lens that has two different powers within it. An example of this is demonstrated in the Ultra 3x-6x hand magnifier. The large portion of the lens has a magnification of 3x, and the smaller lens, which is molded as an integral part of the larger lens, has a magnification of 6x. In spectacle lenses, the upper portion of the lens has a proper prescription for distance viewing and the lower portion has the proper RX for close up viewing.