Key factors for radiuscope measurement accuracy: including an improved lens mount design

The importance of practitioners being able to measure back optic zone radius in verifying rigid gas permeable contact lenses is emphasized. Despite improved standards of manufacturing, errors can occur, and the capacity to verify lenses can be crucial to effective management, especially when new rigid gas permeable materials with unproven stability characteristics are used. Circumstances under which back optic zone radius discrepancies can cause frustration to both patient and practitioner are analyzed as the basis for illustrating the value of either problem anticipation and prevention, or recognition and resolution. Procedures that increase the accuracy of radiuscope measurements are described, including the use of a new lens mount design. The psychology of contact lens verification measurements is discussed, with consideration of procedures that help reduce conflict between laboratory and practitioner on the occasion of questionable quality control.