| Third, most asthenopic symptoms are waxing and waning. |
| Correlation between asthenopic symptoms and different measurements of convergence and reading comprehension and saccadic fixation eye movements. |
| Twelve patients had an esotropia, two an esophoria with asthenopic complaints, 35 an exotropia and two an exophoria with asthenopic symptoms. |
| It is a common cause of asthenopic symptoms and frequently leads to squinting or shielding the eyes as a protective mechanism. |
| We purposely did not select our observers according to the presence or absence of asthenopic complaints. |
| We did not inquire whether the observers had asthenopic symptoms or not. |
