If a lens rotates 10° to the left during a diagnostic evaluation, which parameter should be ordered for the patient?

In this scenario, the lens has rotated 10° to the left during a diagnostic evaluation. This rotation indicates that the orientation of the lens has shifted, and we need to adjust the parameters accordingly to account for this change in position.

The parameter in the prescription that specifically addresses the orientation of the lens is the axis measurement, which is the value following the power specification. The original axis is stated at 180°. When the lens rotates 10° to the left, the new axis becomes 180° - 10° = 170°. Therefore, to align the prescription with the new orientation, the axis should be set to 170°.

The power and diameter measurements remain constant, as they do not change based on lens rotation. Therefore, identifying the option that maintains the same power but adjusts the axis to 170° is essential. This makes the choice with the parameters that include the axis at 170° the correct answer, ensuring the lens is once again appropriately aligned for the patient's vision.