Rodenstock Impression Measuring Kit
- Align the gauge so that reference line runs parallel to the vertical frame front
- Assure that the the space between the upper rim and the ref line, and that at the lower rim and the ref line are the same.
- Keep the wearer's head in a normal gazing position - not tilt too much backwards or tipped too much forward.
- The center of the metal ball indicates the PT value in degrees
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