Vertical Misalignments of the Eyes

Disorders where one eye is higher than the other often cause vertical double vision (diplopia).

Common causes include:

Hyper Deviation

The situation where one eye is higher than the other. When this only occurs when one or both are covered, it is called a "hyperphoria". When it occurs even when both eyes are viewing, it is called a "hyper deviation". Hyperphoria and hyperdeviation generally refer to the situation where the cause is known.

Skew Deviation

Skew deviation refers to a vertical misalignment of the eyes of unknown cause.

References: