Wiktionary
hypertropia
n. (context pathology English) A form of strabismus in which one eye points upward
Wikipedia
Hypertropia
Hypertropia is a condition of misalignment of the eyes ( strabismus), whereby the visual axis of one eye is higher than the fellow fixating eye. Hypotropia is the similar condition, focus being on the eye with the visual axis lower than the fellow fixating eye. Dissociated Vertical Deviation is a special type of hypertropia leading to slow upward drift of one or rarely both eyes, usually when the patient is inattentive.