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The Dantum system is characterized by using the center line as a reference point for other measurements in optometry and opticianry. This system focuses on the alignment of measurements based on the central axis of the optical device or fitting. By establishing a center line, practitioners can accurately gauge dimensions necessary for proper fitting of eyewear or other optical instruments. This reference point ensures that all additional measurements, such as pupil distance or segment height, are consistent and symmetrical relative to the center of the optical framework being used.

Other systems might employ different methodologies or reference points that do not prioritize a central axis in the same way, which is what sets the Dantum system apart in providing a structured approach to measurements. Understanding the role of the center line in this context is crucial for precise fitting and functionality of optical devices.