Prism for Decentration (without background music)

This video explains how decentration is calculated and performed on lens blanks (also known as prism for decentration), and how the prism base direction is determined. This process should only be used on spherically designed front surfaces lenses, available in single vision and segmented; it cannot be used on any aspherically designed front surfaces.
The background music has been removed from this version. No other adjustments were made.