Should frame adjustments be made prior to measuring the fitting cross height for a progressive lens? True or False?

Making frame adjustments prior to measuring the fitting cross height for a progressive lens is essential for ensuring accuracy in the final fit of the lenses. The fitting cross height is the point on the lens where the optical characteristics are optimized for the wearer's vision, and improper adjustments can lead to misalignment, which negatively affects the performance of the progressive lenses.

When the frame is not properly adjusted to the wearer's face — such as ensuring that the frames sit squarely on the nose and that the temple arms align with the sides of the head — it can result in incorrect height measurements. This is particularly important for progressive lenses, which have specific zones for distance, intermediate, and near vision. Accurate fitting cross heights are vital to ensure the patient experiences seamless vision transitions without distortion.

Therefore, making frame adjustments is a crucial step before taking any measurements related to lens fitting, reinforcing the importance of this process in delivering high-quality optical care.