Usage History of 'dioptres'

The following chart shows how frequently 'dioptres' appeared in printed materials over time. For example, the word 'dioptres' occurred 8 times in books in 1842 and 431 times in 2008. From 1842 to 2008, the word 'dioptres' was used a total of 28,395 times in books scanned by Google. See Reference: Google Ngram project.

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