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