NBEO Ocular Motility Practice Test

In Listing's Plane, which axis is vertical?

W axis X axis Z axis Y axis

Correct Answer:

Z axis

Explanation:

Listing's plane is the plane in which the eye’s rotation axis lies when moving from the primary position; eye orientation to any gaze can be represented by a single rotation about an axis that lies in that plane. In the standard NBEO coordinate convention, the vertical direction within Listing's plane aligns with the Z axis, so the axis that serves as the vertical one in Listing's plane is Z. This is why the vertical axis in Listing's plane is Z.

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