Huvitz Excelon XD Operator's Manual page 37

(2) Rotation
To rotate lens shape, touch and drag Rotation Stick.
You can rotate lens shape clockwise or counterclockwise.
Rotate 20 degrees (Clockwise, Right Lens)
(3) Near Vision Area Enlargement/Reduction
This function only applied to near vision area.
To change lens shape, touch bottom out line of the lens and
drag downward or upward.
Excelon XD Operator's Manual
Rotation Stick
37