What could happen if the segment height is too high?

• A. Prisms misalignment
• B. Patient could fall
• C. Frames loosen
• D. No noticeable effect

Answer: (B)

Segment height is where the reading portion of a bifocal or progressive lens sits relative to the wearer’s line of sight. If that segment is mounted too high, the nearer zone sits well above the user’s normal viewing path. In everyday activities, especially when walking, people look a bit downward to see the ground and read—so a too-high near segment means they have to tilt their head or body awkwardly to find the reading area. This misalignment can disrupt balance and depth perception, making it easier to misjudge steps or obstacles and increasing the risk of a fall. Proper fitting places the reading segment where a natural downward gaze lines up with the near zone, without awkward posture.