What factor can affect the fitting and alignment of the frame and lenses?

The fitting and alignment of the frame and lenses are primarily influenced by the anatomical features of the person's face, including the shape of the nose. This is crucial because a properly fitting frame needs to rest comfortably on the nose to maintain its position, ensuring that the optical centers of the lenses align with the line of sight. An ill-fitting nose bridge can cause frames to slip down, tilt, or sit improperly, affecting vision and comfort.

While the width of the temples does play a role in how well a frame adheres to the sides of the head, and the color of the lenses can influence aesthetic considerations, they do not significantly impact the primary alignment and fitting as much as the anatomical shape of the nose does. Therefore, focusing on the nose shape is critical to achieving a proper fit that effectively supports both the frame and lenses in their intended position.