<unk>  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<unk>  leading to slow upward drift of one or rarely both eyes, usually when the patient is inattentive.
Hypertropia
Quadrantanopia
Emmetropia
Cyclotropia
Heterotopia 
Ocular dysmetria
Exotropia
Nyctalopia