When fitting aspherics, how should you mark up the frame?

• A. Like standard single-vision with no marks
• B. Similar to how you mark up progressives
• C. No marks allowed
• D. Only mark center of pupil

Answer: (B)

When fitting aspherics, you need to communicate how the frame sits on the face to the lab, because the lens power changes across the surface and its best viewing zone must line up with the pupil as the frame is worn. Marking the frame like you do for progressives provides clear reference points for frame tilt, pantoscopic angle, and where the optical center should align with the pupil. This helps ensure the aspheric portion sits correctly relative to the eye and that the distance/near zones (or the intended viewing zones) line up with where the wearer looks. Without those marks, decentration or tilt can shift the aspheric region away from the pupil, causing blurred edges and discomfort. So, using progressive-style marks gives the lab the information needed to place the lens accurately in the frame.