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.
Albert Burg (1968) studied this question.