In Listing's Plane, which axis is vertical?

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Multiple Choice

In Listing's Plane, which axis is vertical?

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.

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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