hypotropia

Hypotropia is a manifest strabismus in which one eye is displaced downward relative to the other.¹ In any heterotropia the visual axes do not intersect at the point of fixation, and a latent downward imbalance of the same kind is called a hypophoria.¹

Vertical deviations are relative, so a left hypotropia and a right hypertropia describe the same misalignment. The term hypotropia still earns its place because it names the fixating eye; a left hypotropia means the higher right eye is fixating.² Like other heterotropias, a hypotropia may be constant or intermittent, and comitant or incomitant.² A hypotropic eye often brings a pseudoptosis of the eyelid, which disappears once the eye is straightened.³