What does the fitting cross indicate in the markings of a progressive lens?

What does the fitting cross indicate in the markings of a progressive lens?

• A. The position of the pupil on the lens.
• B. The optical center offset.
• C. The frame center.
• D. The diameter of the pupil.

Answer: (A)

The fitting cross is a pupil reference point on progressive lenses. It marks where the wearer’s pupil should sit on the lens so the eyes look through the correct parts of the lens—the distance portion at the top, the intermediate area in the middle, and the near portion at the bottom. Properly aligning the pupil with this cross ensures accurate zone alignment and comfortable vision across all viewing distances, while reducing distortion that comes from misalignment. It’s not about the frame’s center or the pupil’s size; it specifically indicates the pupil’s position on the lens to guide fitting and alignment.

The fitting cross is a pupil reference point on progressive lenses. It marks where the wearer’s pupil should sit on the lens so the eyes look through the correct parts of the lens—the distance portion at the top, the intermediate area in the middle, and the near portion at the bottom. Properly aligning the pupil with this cross ensures accurate zone alignment and comfortable vision across all viewing distances, while reducing distortion that comes from misalignment. It’s not about the frame’s center or the pupil’s size; it specifically indicates the pupil’s position on the lens to guide fitting and alignment.