LARS axis adjustment is based on which clock hour?

• A. 3 o'clock
• B. 6 o'clock
• C. 9 o'clock
• D. 12 o'clock

Answer: (B)

The LARS axis adjustment uses a clock-hour reference tied to the direction of the shift you need to correct. LARS stands for Left, Above, Right, Below, and each direction maps to a clock-hour position on the eye. The “Below” direction corresponds to the 6 o’clock meridian, so the axis is set with reference to 6 o’clock. In other words, when applying LARS, the standard reference for the axis is the inferior (below) position, which is 6 o’clock. The other directions align with the other clock hours (left, above, right), but the axis adjustment in this method uses 6 o’clock as the key reference.