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A comparison of the prism rock test to standard convergence tests

1 March 1977


Fifty-nine volunteer college students were used as subjects. Phorias and base in ductions were correlated with base in prism rock performance. Base out ductions and phorias at near and far were not correlated with base out prism rock. Base out. prism rock findings were positively related to base in prism rock performance. Correlation between base out and base in prism rock was not high enough t o warrant individual prediction. There appears to be separate systems at work for divergence and convergence.


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