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April 1941


Arch Ophthalmol. 1941;25(4):576-581. doi:10.1001/archopht.1941.00870100054006

In a recent publication1 a new subjective method of refraction was described and clinical data obtained by the procedures were presented. This method involves the determination of the refractive power which will produce maximal visibility2 as appraised by thresholds of brightness contrast rather than of visual acuity. By providing a convergence target of sufficient size and indistinctness, the method permits the functioning of convergence in the proved absence of any adequate stimulus for either positive or negative relative accommodation. Furthermore, in contrast to the usual methods of refraction, the procedures are identical in the static and dynamic tests. Hence the specific characteristics of the accommodation-convergence coupling are clearly revealed. For example, it has been shown that normal adult nonpresbyopic eyes in a so-called physiologic state of rest are accommodated for a point anterior to the retina and that there is no evidence of a lag of accommodation at

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