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THE ACCOMMODATION AND DONDERS' CURVE AND THE NEED OF REVISING OUR IDEAS REGARDING THEM:  AN EXPERIMENTAL STUDY

ALEXANDER DUANE, M.D.
JAMA. 1909;LII(25):1992-1996. doi:10.1001/jama.1909.25420510026002f.
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NEED OF REVISING DONDERS' WORK  Of the many invaluable contributions that Donders made to our science certainly one of the most important was his determination of the range of accommodation at different ages. His researches, indeed, all admit to be fundamental. For that very reason we must avoid ascribing to them an exactitude and a validity which they do not possess and which Donders himself did not claim for them.1 For we must remember that the number of cases utilized by Donders was small and the individual variations that they presented were rather considerable. Thus his estimate that 7 D represents the normal range of accommodation at the age of 30 is based on but five cases, the accommodation of which was found to vary between 6 and 9 D. It is obvious that more numerous observations might have extended these limits in either direction and have given a

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