Three years ago I presented a report to the Association,1 giving measurements of the accommodation in some six hundred subjects of all ages, and deducing from these measurements a revision of the standards which Donders had established for the progress of presbyopia and which for fifty years had been universally accepted. After the paper was published, its results were adopted by various authorities2 as a substitute for those of Donders.
Since then my researches have been carried on continuously. A number of new cases have been added, and the findings in some of the old cases have been revised. In all, nearly 1,500 subjects have been examined, and out of these considerably over 1,000 have been utilized. The results thus obtained are now presented.
The details of the method pursued in making the investigation were fully described in the previous paper, and will not be repeated here. Suffice
DUANE A. NORMAL VALUES OF THE ACCOMMODATION AT ALL AGES. JAMA. 1912;LIX(12):1010–1013. doi:10.1001/jama.1912.04270090254042
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