Abstract
As part of a large-scale research project investigating the relationships between vision and driving, over 17,000 subjects, of both sexes and ranging in age from 16 to 92, were administered a distance phoria test utilizing a modified Thorington apparatus and red Maddox rod. Analysis of the resultant data reveals a slight but statistically significant trend toward exophoria with increasing age; however, this trend is not a consistent one, and is more pronounced for women than it is for men. These findings are discussed and compared with the results of previous studies.
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