Usage History of 'multifocal'

The following chart shows how frequently 'multifocal' appeared in printed materials over time. For example, the word 'multifocal' occurred 8 times in books in 1910 and 21,535 times in 2008. From 1910 to 2008, the word 'multifocal' was used a total of 376,001 times in books scanned by Google. See Reference: Google Ngram project.

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