Usage History of 'aspheric'

The following chart shows how frequently 'aspheric' appeared in printed materials over time. For example, the word 'aspheric' occurred 2 times in books in 1869 and 2,789 times in 2008. From 1869 to 2008, the word 'aspheric' was used a total of 58,534 times in books scanned by Google. See Reference: Google Ngram project.

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