Usage History of 'bifocal'

The following chart shows how frequently 'bifocal' appeared in printed materials over time. For example, the word 'bifocal' occurred 2 times in books in 1745 and 3,206 times in 2008. From 1745 to 2008, the word 'bifocal' was used a total of 125,966 times in books scanned by Google. See Reference: Google Ngram project.

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