Which term describes when both eyes rotate about the z axis to the left during versions?

• A. Dextroversion
• B. Levoversion
• C. Dextrocycloversion
• D. Levocycloversion

Answer: (B)

When both eyes move together, that’s a version. If there’s any torsional component—rotation around the z axis—that’s cycloversion. The direction is described with levo- or dextro- for left or right, and cycloversion specifies that both eyes rotate in the same torsional direction. If the eyes twist so that the top poles rotate toward the left, that is leftward torsion during a version, i.e., levocycloversion.

So this movement combines leftward torsion with a conjugate horizontal gaze. The horizontal left gaze without torsion would be levoversion, and torsion to the right would be dextrocycloversion, while torsion to the left is levocycloversion.