Lesions around the aqueduct at the superior collicular level of the midbrain cause a voluntary and reflex paralysis of vertical gaze in that direction.
This is because this area controls the conjugation of the two eyes in the vertical plane, as well as convergence movements.
Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page