Most users skip this, but the CTD excels here if you do it right:
The Kappa uses a tracing arm to "read" the frame shape. essilor kappa ctd user manual
Disclaimer: Always refer to the official Essilor Kappa CTD User Manual (Version 4.2 or later) for safety and specific procedures. This post is a summary guide for trained professionals. Most users skip this, but the CTD excels
Mastering the Essilor Kappa CTD: A Practical Guide to the User Manual & Daily Operation Mastering the Essilor Kappa CTD: A Practical Guide
The edged lens has a bevel that is too high (vaulting) or too low (grooving).
As with all lab equipment, safety is paramount. The manual advises wearing eye protection when handling lenses and ensuring the unit is plugged into a grounded, surge-protected outlet to protect the sensitive internal electronics.
Print pages 62-68 (Troubleshooting & Calibration) and laminate them. Tape that next to the machine. And for the love of optics, do not lose the ceramic calibration ring—it costs more than your monthly coffee budget.