Center the trial frame on the patient’s face
Adjust the nose pads so the frame sits level and comfortable
Align the frame bridge with the center of the nose
Measure the distance between the centers of the pupils
Set the monocular PD on the trial frame using the left and right pupil centers
Move each lens holder horizontally until each lens center matches each pupil center
Check that the frame is not tilted up, down, or to either side
Recheck the PD alignment from the front at eye level
Confirm the patient is looking straight ahead
Tighten the frame adjustments after the PD is set
Verify the final alignment before placing trial lenses