The fitting cross on a PAL is a reference point for:

• A. Monocular PD
• B. Monocular PD, fitting height/seg height, and patient's line of sight
• C. Binocular PD
• D. Frame height

Answer: (B)

The fitting cross on a progressive lens serves as the reference for aligning the lens to the wearer’s eyes. It marks where the optical centers should line up with the pupil and where the progressive changes begin, so you can correctly transfer the wearer’s monocular PD to each lens and set the vertical position of the progressive zone (the seg height). It also guides placement relative to the line of sight, ensuring that when the user looks straight ahead, their gaze passes through the intended part of the lens. Proper placement of the fitting cross helps ensure comfortable, accurate vision across distance, intermediate, and near.