Heterotropia

What it means

Manifest deviation of the visual axes not controlled by fusion.

The distinction between heterotropia and heterophoria is that heterotropia refers to a misalignment of the eyes when the affected individual is looking at an object while the eyes are uncovered whereas heterophoria is a misalignment that is observed only when the two eyes are no longer looking at the same object. The monocular cover-uncover test is the most important test for detecting the presence of manifest strabismus and for differentiating a heterophoria from a heterotropia.

Part of the broader category