The distance from the geometric center to the center of the seg is called what?

The distance from the geometric center to the center of the seg is called what?

• A. Inset
• B. Seg Inset
• C. Total Inset
• D. Near PD

Answer: (C)

In segmented lenses, the near segment is placed offset from the lens’s geometric center. The horizontal distance from the lens center to the center of that near segment is called the total inset. This term specifically captures the overall decentering of the segment relative to the lens center, which is exactly what the question is describing. Some sources might refer to related ideas as segment inset, but the measurement from the geometric center to the segment center is what practitioners call the total inset. Near PD is a different measurement related to pupil distances, not the segment’s position.

In segmented lenses, the near segment is placed offset from the lens’s geometric center. The horizontal distance from the lens center to the center of that near segment is called the total inset. This term specifically captures the overall decentering of the segment relative to the lens center, which is exactly what the question is describing. Some sources might refer to related ideas as segment inset, but the measurement from the geometric center to the segment center is what practitioners call the total inset. Near PD is a different measurement related to pupil distances, not the segment’s position.