Rapid, irregular eye movements that may be horizontal, vertical, or rotary, depending on the underlying cause, are symptoms of ________.

Rapid Movements

Quick, fast actions or motions, which can be physical movements of the body or parts of the body.

Horizontal

Oriented parallel to the ground or to the bottom and top edges of something, as opposed to vertical.

Vertical

Oriented upward, perpendicular to the horizon or a horizontal plane.