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Bifocal is described in multiple online sources, as addition to our editors' articles, see section below for printable documents, Bifocal books and related discussion.

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How retirees can save on prescription eyeglasses
You can easily spend $200 for a basic pair, but if you want designer frames or need bifocal or progressive lenses the price can more than double. Here are a few different options that can help you save. Medicare/Insurance Coverage.
Wide field-of-view bifocal eyeglasses
The Bug With Fast Growing Bifocal Eyes
Dr. Elke Buschbeck, a University of Cincinnati professor of biological sciences and graduate student Shannon Werner discovered the Sunburst Diving Beetle has bifocals, the only insect with them so far.
Savvy Senior: How retirees can save on prescription eyeglasses
Dear Savvy Senior, What tips can you recommend for finding affordable prescription eyeglasses? I used to have vision insurance through my work, but lost it when I turned 65, retired and signed up for Medicare. — Looking For Eyeglasses.

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