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Bifocals

For the bifocal tensor, see Fundamental matrix (computer vision).
A bifocal lens with areas of differing magnification
Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn.

Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.

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